imr 4166 load data 223 imr 4166 load data 223

First ladder turned out great! . Loading density is perfect for magnums, contributing to superb uniformity. Where to Find IMR 4166 Powder very consistent in .243 shooting 65gr vmax and 3550 fps. I'm very happy with this powder. Was looking for an equivalent powder from H4895 when I ran into the 4166. IMR 4166 possesses the fastest burn rate in the Enduron lineup. IMRs press release provides these descriptions of the new Enduron propellants: IMR 4166 is the first in the series of Enduron propellants. Trim to length as needed, clean/uniform the primer pockets, reprime, charge with powder, verify powder charges, seat bullets to specific overall length, perform final inspection, box, and label. Clearly, the competitor's 'choice' and the Varmint Hunter's 'dream powder.'. We are engineers, reloading enthusiasts and operate one of the most powerful ballistics calculators. Clean and inspect the cases, lube and full-length resize/decap, clean, and inspect them again. This powder is comparable to Hodgdon H4831. The IMR brand was first introduced under DuPont in the 1930s. Well, Im done Adulting for Today and Tomorrow. If you commonly use Varget, Alliant Reloder 15, Norma 203B, IMR 8208 XBR, or Vihtavuori N140, you might want to try IMR 4166. These new powders should compete directly with the Hodgdon Extreme Series, which gives shooters more temp-stable powder options to consider. The main features of the Enduron series are copper fouling eliminator, insensitivity to temperature changes, ideal loading density and being environmentally friendly. We are engineers, reloading enthusiasts and operate one of the most powerful ballistics calculators. PrecisionRifleBlog.com (PRB) recently published results from a field test PRB conducted to quantify the temperature stability of the popular Hodgdon H4350 and Varget powders and compare those to IMRs new Enduron line of powders, specifically IMR 4166 and 4451. It is an extruded powder with a perfect burn speed for cartridges like 308 Winchester, 7.62mm NATO, 22-250 Remington or 257 Roberts, among other cartridges. It provides top performance in big game cartridges such as 25-06, 280 Remington and 300 Winchester Magnum. It was less accurate than 4 other powders. IMR recommends always consulting www.IMRReloading.com for the most accurate, up-to-date data. First load. You can find that here: http://precisionrifleblog.com/2016/06/19/powder-temp-stability-hodgdon-extreme-vs-imr-enduron/, Share the post "Powder Temp Stability IMR Enduron vs. H4350 and Varget". These are the first groups with this powder. It is expected to perform well in the .308 Winchester and in 6mm cartridges running the heavier (95-107gr) projectiles. The weight of a kernel of 4166 was almost double the weight of a kernel of H4895, and they were clearly larger. More about this powder: IMR Enduron 4166 is a versatile, match-grade propellant, with the fastest burn rate in the Enduron line. IMR is bringing out a new series of advanced-formulation extruded powders. Hodgdon's excellent online reloading data show only IMR 4007SSC, IMR 4166, IMR 8208XBR, and Hodgdon CFE 223 breaking 3,750 fps with a 55-grain bullet in a 24-inch test barrel. Please help us to improve and report any suggestions via our contact form. Comprehensive load data for IMR 4166 Enduron reloading powder und technical specifications for this propellant. Environmentally friendly - Enduron technology is environmentally friendly, crafted using raw materials that are not harmful to the environment. . In fact, E. I. duPont arrived in America in 1800 determined to make an improved gunpowder and, by 1802, was producing gunpowder in a new plant along the Brandywine River in Wilmington, Delaware (this plant morphed into what is today the GOEX brand of black powder). This propellant is ideally suited for many mid-range burn speed cartridges. Tag: IMR 4166 Loading for the AR-15 with the LEE Auto-Drum Powder Measure. Youll also find official load data in the Hodgdon 2020 Annual Manual. Key: Admin , Global Mod , Mod RR2/3-22 UDG-IP JavaScript is disabled. Then Try IMR 4166 Powder, Powder Temp Stability IMR Enduron vs. H4350 and Varget, http://precisionrifleblog.com/2016/06/19/powder-temp-stability-hodgdon-extreme-vs-imr-enduron/, Powder Temp Stability: IMR Enduron vs. Hodgdon Extreme, Guide to IMRs Enduron Powders What You Need to Know, Powder Valley has new IMR 4166 Powder in Stock, IMR Introduces New Enduron Powders: 4166, 4451, 7977. Other than that , great job, thanks. This ensured the powder charges were identical for each round of ammo. Awsome powder in my book. Share the post "Cant Find Varget for Sale? The Enduron Technology powders are available in one-pound (1 lb) and eight-pound (8-lb) containers from quality reloading retailers. PRBs testers talk about those things, provide a few other insightful views of the data, and discuss tools that can help you manage temp/muzzle velocity in the field in their full post. Cant Find Varget for Sale? Anyone seen/tried this combo? IMR recommends always consulting www.IMRReloading.com for the most accurate, up-to-date data. This propellant performs comparably to Hodgdon Varget but charge weights are materially different. In 2003, Hodgdon Powder Company acquired the IMR brand bringing these prestigious powders under the umbrella that also includes Hodgdon, Winchester and GOEX. Loading density is perfect for magnums. Love the copper fouling eliminator makes cleaning a breeze, Posted by Paul rosenkranz on Nov 9th 2021. Perhaps the new IMR 4166 will be as good or better. temperature stable too. Copper fouling should be minimal, allowing shooters to spend more time shooting and less time cleaning a rifle to retain accuracy. Cant find Hodgdon Varget on dealers shelves? Trail Boss Reduced Rifle Load. Share your experiences with other customers. First run tomorrow. Using Hodgdon's online Reloading Data Center I find IMR 4166 listed as an appropriate powder for several 223 loads, from 50 grains bullets all the way up to 90 grain bullets. Will purchase more. IMR Enduron 4166 is a versatile, match-grade propellant, with the fastest burn rate in the Enduron line. Find load data for IMR 4227 propellant by clicking the button "Loads for this Powder".More about this powder:IMR 4227 is a medium burn speed, magnum pistol propellant. On the official Hodgdon/IMR burn rate chart, IMR 4166 is between H4895 and Varget. 7977 is the slowest of the batch, for shoulder thumpers like the .338 Lapua and the .470 Nitro Express. The new powder line-up comes in three flavors: 4166, 4451 and 7977. Powders include IMR 5 rounds shot Share the post "Powder Valley has new IMR 4166 Powder in Stock". IMR 4166 + 55gr V-Max in 223 Rem tailbon3 Jan 19, 2017 Help Support Long Range Hunting Forum Become a supporting member tailbon3 Well-Known Member Joined Aug 24, 2009 Messages 84 Jan 19, 2017 #1 I'm looking for some load data for the 55gr V-Max in 223 Remington with IMR 4166. . The new line of IMR Enduron powders feature small kernels for easy metering, plus a built-in copper fouling eliminator. Its loading density is perfect for magnum cartridges and contributes to superb uniformity, yielding outstanding performance in 300 Winchester Magnum, 7MM Remington Magnum and .338 Lapua Magnum. bolt reload data with 65gr. Thanks, T.B. Shooters looking for readily-available alternatives to hard-to-find extruded powders should definitely check out the Enduron line-up. Varmint shooters with small-bore cartridges love it. You are using an out of date browser. Copper fouling reduction these powders contain an additive that drastically reduces copper fouling in the gun barrel. I live in florida and shoot the same load all year. By that, they mean the change per degree from 20 to 65 might be smaller or larger than the change per degree from 65 to 140. 4451 is the medium burning powder, for medium cartridges like the .30-06 Springfield and the .270 Winchester. VAT (where applicable), shipping costs and possible delivery charges. Shooter's Reference Load Data for .223 Remington .223 Remington - Published Manufacturer Loading Data Shellholders: Hornady #16 Lee #4 Lyman #26 RCBS #10 Recipe Type: Rifle 55,000 PSI STANDARD SAAMI COMMERCIAL SPECIFICATIONS Pistol CUSTOM LONG THROAT Reduced Load Bullet Weight: ALL 30 gr 34 gr 35 gr 36 gr 40 gr 42 gr 43 gr 45 gr 50 gr 51 gr 52 gr IMR powder has long been a choice powder for knowledgeable reloaders. Improved Military Rifle IMR 3031 Improved Military Rifle IMR 4064: 5.56 x 45 mm: Accurate 2495 VihtaVuori N135 VihtaVuori N140: Hodgdon CFE 223 Hodgdon H 335 Improved Military Rifle IMR 8208 XBR VihtaVuori N530 VihtaVuori N540: 5.6 x 50 Magnum: Improved Military Rifle IMR 4064 Winchester 748: 5.6 x 57: Improved Military Rifle IMR 4320: 5.7 x 28 . FPS low 2735 high 2789. IMR now offers four Enduron powders that cover a broad range of burn rates. IMR recently released a new line of powders with Enduron Technology which is also marketed to have extreme temperature stability. * All prices incl. To me that says Gebby got it right long ago. Between 1/3 and 1/2 MOA for 5 shot groups at 200yd. bolt reload data with 65 gr. Tried their 7977 in a magnum rifle and it had same accuracy as H1000. Or maybe have QuickLoad data? Load data should be forthcoming pretty soon. It provides top velocities and performance with heavier bullets in medium-sized magnums. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; IMR states that IMR 4166 is a versatile, match grade propellant. Access from your Country was disabled by the administrator. Find load data for IMR 4166 Enduron propellant by clicking the button "Loads for this Powder".More about this powder:IMR Enduron 4166 is a versatile, match-grade propellant, with the fastest burn rate in the Enduron line. At 600 yds, the POI with 4166 loads was about 1.2 MOA higher than when using 43.2 gr. We do not take backorders and our Tech Services team cannot take orders via email or phone. I tried 4166 and my groups opened up. Share the post "Guide to IMR Enduron Powders: 4166, 4451, 4955, 7977, 8933". .308 Winchester (IMR-4166 Data) Warning! IMR Enduron 4166 is a versatile, match-grade propellant, with the fastest burn rate in the Enduron line. Here on Ultimate Reloader you can count on a LOT of AR-15 content coming over the next year: everything from reloading .223/5.56, to hunting, a lot more with suppressors, and some custom AR-15 rifle action! IMR 8208 XBR is accurate, clean-burning, and offers good velocity. 17 reviews. this stuff is not affected temp at all. var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; IMR 7977 performs comparably to Hodgdon H1000 but charge weights are materially different. Reloading 223/ 5.56 for the AR-15 with IMR 4166 30-06JOHN, GUNS AND RELOADING 1.86K subscribers 2.8K views 1 year ago I reload .223/ 5.56 for the AR-15 using a powder not popular, IMR. It is primarily a pistol powder but has some application in rifles. Anyway, I like the 4166! For magnums with light- to medium-bullet weights, IMR 4350 is the best choice. Love the copper fouling eliminator makes cleaning a breeze. Weve been quite pleased with IMR 8208 XBR as a Varget alternative. It provides top performance in big game cartridges such as 25-06, 280 Remington and 300 Winchester Magnum. For a better experience, please enable JavaScript in your browser before proceeding. - 24hourcampfire Previous Thread Next Thread Print Thread Hop To BP-B2 IC-A B3 IC-B B4 RR1-22 Who's Online Now 828 members ( 10Glocks, 12344mag, 007FJ, 1911a1, 1100mag, 95 invisible), 2,340 guests, and 1,313 robots. Find load data for IMR 7977 Enduron propellant by clicking the button "Loads for this Powder".More about this powder:IMR Enduron 7977 is a slower burn rate in the Enduron family. Thats because a change in temperature can affect the trajectory or flight path of the bullet in two well-known ways: 1. I shot a 4.125", 10-shot group at 600 yds - well under 1 MOA and slightly better than my Varget loads, although they were close enough that I attribute the difference to the shooter. When we are sold out, we are sold out. IMR 4166 powder? The main features of the Enduron series are copper fouling eliminator, insensitivity to temperature changes, ideal loading density and being environmentally friendly. Some of our Forum members have reported excellent results with IMR 4166 in cartridges that work with Varget, such as the 6mmBR, 6 Dasher, 6.547 Lapua, and .308 Win. DuPont had historically been a major supplier of military propellants long before becoming one of the handloaders favorite powders. This propellant performs comparably to Hodgdon H4350 but charge weights are materially different. This allows up to 4% more powder space in the case and in many loads yields more velocity than standard 7828. It acts a whole lot like Varget, but is much easier to find. If you commonly use Varget, Alliant Reloder 15, Norma 203B, IMR 8208 XBR, or Vihtavuori N140, you might want to try IMR 4166. Loads case to bottom of bullet, clean burning, very consistent, accurate results with no flyers, flows thru powder measure with a. IMR 7977 has the slowest burn rate among the Enduron Technology powders. Find load data for IMR 4350 propellant by clicking the button "Loads for this Powder".More about this powder:IMR 4350 is a medium- to slow-burn rate propellant and is the number one choice for the new short magnums, both Remington and Winchester versions. Sign up to get updates and access to exclusive promotions. Anyone seen/tried this combo? Some powders are more affected by changes in temperature than others. var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); (The only two .45-70's I own are trapdoor Springfields.) This powder is comparable to Hodgdon H4831. That is very, very low. We do not take backorders and our Tech Services team cannot take orders via email or phone. IMR recommends always consulting www.IMRReloading.com for the most accurate, up-to-date data. Testing consisted of a single 5-shot group of each incrementmental charge weight just to get a rough feel for the potential of this powder. Choosing 4166, I decided to use it in place of my usual choice of Varget in a known accurate cartridge and rifle combination. Find load data for IMR 3031 propellant by clicking the button "Loads for this Powder".More about this powder:A medium burn speed propellant with many uses, IMR 3031 has long been a favorite of 308 Match shooters using 168-grain match bullets. Most powders arent specially formulated to be temperature stable. IMR 4166 possesses the fastest burn rate in the Enduron lineup. To be able to use the full range of Shopware 6, we recommend activating Javascript in your browser. IMR 7977 is a slower burn rate in the Enduron family. The kid's rifle didn't like this powder, but perhaps yours may. For example, IMR 4166 is a good replacement for Hodgdon Varget (commonly used in the .223 Rem, 6mmBR and .308 Win), while IMR 4955 is a fine substitute for H4831 (favored by F-Open shooters for the .284 Win and 7mm WSM cartridges). I didn't want to like this stuffI figured I was likely buying marketing hype for $31/lb at my LGS. The LabRadar is a new type of device that allows you to measure muzzle velocity within at least +/- 0.1% of the reading. IMR 4955 is a medium burn speed powder, falling in between IMR 4451 and IMR 7977 in burn speed. Loads case to bottom of bullet, clean burning, very consistent, accurate results with no flyers, flows thru powder measure with a. _gaq.push(['_setDomainName', '.accurateshooter.com']); IMR 4166: This newer propellant produced by General Dynamics in Canada had the best temperature insensitivity and may be the best substitute for Varget across a wide temperature range with 77 to 80 grain bullets. IMR 7977 is comparable to Hodgdon H1000. works great in many cartridges with good to great accuracy. * All prices incl. Choose a IMR powder and find the respective load data for it. 110 PCS pistol, 2022 Editors Choice Award Winning Ruger 5.7 LC Carbine, 2022 Editors Choice Award Winning Mossberg 940 Pro Tactical 12-gauge, Fiocchi Introduces New 5.7x28mm Subsonic Ammo, Lehigh Defense 115-gr. so I am thinking till powder does come available, load one or 2 levels under Max for a 223 into the 556 cases. The IMR Enduron line is similar to Hodgdon's Extreme Extruded line, in that it is temperature insensitive. The technology in IMRs Enduron line of powders provides four very important qualities that enhance both in-gun and downrange performance. New customer? The main features of the Enduron series are copper fouling eliminator, insensitivity to temperature changes, ideal loading density and being environmentally friendly. I went to the IMR site and it takes you to hodgdon's loading site. The components in question make up my service rifle load in .223 and they are Hornadys 55 grain V-max bullet seated into a Lake City brass case at an OAL of 2.270 and ignited with a Wolf Small Rifle Primer. . _gaq.push(['_setDomainName', '.accurateshooter.com']); This propellant performs comparably to Hodgdon Varget but charge weights are materially different. Hodgon VARGET, IMR 3031, IMR 4064, IMR 4166 Enduron, IMR 4831, IMR 4895, Lovex D073.6, Lovex S060, . Please enter your login details below. Being a short-grain extruded powder it can be dumped from a powder measure; however I always opt to use a dispenser like the Hornady Auto charge. This helps attain low ES/SD in velocity and pressure, which translates to improved long-range accuracy and tight verticals. When we are sold out, we are sold out. Many F-Open competitors are now using Reloder 16 with considerable success. IMR 4451 Another new Enduron powder that gives top performance in the venerable .30-06, 270 Winchester, and 300 Winchester Short Magnum, to name just a few. $25.45 The main features of the Enduron series are copper fouling eliminator, insensitivity to temperature changes, ideal loading density and being environmentally friendly. (function() { Subscribe to the free newsletter and do not miss any news or promotions. It is an extruded powder with a perfect burn speed for cartridges like 308 Winchester, 7.62mm NATO, 22-250 Remington or 257 Roberts, among other cartridges. The maxorder quantity of any powder SKU is, https://shop.hodgdon.com/sites/www/files/2022-04/2022-IMR%20Endurons%20SDS.pdf, https://shop.hodgdon.com/sites/www/files/2020-08/sell-sheet-imr-enduron-final.p. Precision shooters will find an Enduron option well-suited to most of the popular precision cartridge types. It is equally effective in small-capacity varmint cartridges from 223 Remington to 22-250 Remington, and it's a great 30-30 Winchester powder. The 6.5 responded well to the precisely weighed powder charges in carefully prepared cases. Newtosavage Dec 9, 2020 #9 ericwh Well Known Rokslider Joined Mar 9, 2017 Messages 479 Location PA Powder Temp Stability: Hodgdon Extreme vs. IMR Enduron IMR 4166 is part of their new Enduron line that launched just a few years back. Reloading for 223/556 Service Rifle Competition (NRA/CMP bullseye . Such loads are marked with an asterisk in the data to show where standard 7828 will not fit. VISIT THE RDC WHITE HOTS White Hots 50/50 is a 50 Caliber, 50 grain pellet for muzzleloaders. The technology in IMRs Enduron line of powders provides four very important qualities that enhance both in-gun and downrange performance. 2. Learn more about Enduron powders at www.enduronimr.com. The accuracy results were almost identical to those of Varget, with my best group coming in at 1.05 MOA from a 24.6-grain charge of 4166not bad for an initial round of load development. Precision shooters will find an Enduron option well-suited to most popular precision cartridge types. Shooters has been keeping it around $20/lb if you buy in quantity. .45 ACP and .38 Super, while their rifle offerings range from .223 Remington to .30-06 Springfield. So they would likely show much larger swings than what these four top-performing powders showed. I have had good luck with 4166 in .223 bolt rifles. Be Alert: Publisher cannot be responsible for errors in published load data. I went online and found data published by the manufacturer, so I worked with that for my 30 06. One member wrote: in my 6.547 IMR 4166 gives speeds and accuracy pretty much exactly the same as Varget. And other shooters have observed reduced copper fouling with Enduron series powders, so IMRs Enduron anti-fouling chemistry does seem to work. Guide to IMR Enduron Powders Temp Stable, Reduced Fouling, IMR Introduces New Enduron Powders: 4166, 4451, 7977, Guide to IMRs Enduron Powders What You Need to Know, IMR Enduron 8133 New Slow-Burn-Rate Magnum Powder, IMR Powders introduces IMR 4955 Enduron Powder. They both love it. Ive heard some say 4166 is similar to 4064, which I haven't used or have on hand currently. Reduced Rifle Loads. Was able to find a node fairly quickly and with a little seating adjustment, it's shooting .3 moa or better. Address: xxl-reloading.com, Gartenweg 9, 83661 Lenggries, Germany. Will purchase more. I use this powder in my 6mm dasher bench gun. (function() { spitzer boat tail & imr 4166, 223 80 gr bullet imr 4166, 223 load with imr 4166, 243 barnes 80 gr ttsx imr 4166 load data, 243 barnes 80gr ttsx imr 4166 load data, 243 barnes ttsx with imr 4166 load data, 243 barns ttsx with imr 4166 . The main features of the Enduron series are copper . When I approached Chris Hodgdon with the question Does it stop copper from fouling or remove it with each shot? with a smirk he responded Its a proprietary formula. I haven't seen any Hornady loads in the manual using 4166. CL 2.005 I'm very happy with this powder. Moving on, the individual loads were fired and the barrel was allowed to cool between each group. Thread starter cornhusker; Start date Sep 18, 2017; Forums. JavaScript is disabled. IMR offers a modern line of powders with Enduron Technology which is also marketed to have extreme temperature stability. I've had good luck with 8208 with 77gr SMK's and 69gr Nosler Competition Customs Hoon Rating - 100% 1 0 0 Joined Mar 2, 2013 Messages CC 300 BLK ($53.49 per box of 20), Law Tactical Gen 3-M AR Folding Stock Adapter, 2022 Editors Choice Award Winning Silencer Central Banish Backcountry Suppressor. For more information, go towww.P65Warnings.ca.gov. I bought all three. This included the top-of-the-line Prometheus Gen II Powder Scale, which is capable of loading to the nearest kernel of powder. Assuming all other environmental conditions remain the same, an increase in air temperature will cause a flatter trajectory due to a lower air density (easier for the bullet to cut through the air). Third, Enduron powders are designed for optimal load density. To be able to use the full range of Shopware 6, we recommend activating Javascript in your browser. IMR claims that Enduron powders are not sensitive to temperature changes. This demand lead to an incredible 2.5 billion pounds of smokeless propellants being manufactured by DuPont for Allied Forces in World War II. . Improved Military Rifle IMR 4166 Improved Military Rifle IMR 4320 Improved Military Rifle IMR 4350 Improved Military Rifle IMR 4451 Improved Military Rifle IMR 4831 Improved Military Rifle IMR 4895 Improved Military Rifle IMR 8208 XBR Improved Military Rifle SR 4759 Ramshot Big Game Ramshot TAC Ramshot X-Terminator Shooters World AR PLUS It may not display this or other websites correctly. Versatility with uniformity and accuracy. I was planning to switch to 4166 for my .308, but it seems that it has also become nearly impossible to source. Share the post "Powder Temp Stability: IMR Enduron vs. Hodgdon Extreme". This is a true magnum propellant yielding outstanding performance in 6.5-300 Weatherby, 264 Win Mag, 28 Nosler and 300 Rem Ultra Mag, among other cartridges. Optimal load density - Enduron powders provide optimal load density, assisting in maintaining low standard deviations in velocity and pressure, a key feature for top accuracy. OAL 2770 Sierra Case Fired from My Rock River Arms National Match upper, these rounds consistently fetch accuracy in the .75 to 1.25 MOA area. Thanks, Posted by Phillip Jackson on Aug 1st 2021. Really like this powder, the accuracy it produces is amazing I will lots more if I can find it. It's been over two years of this ammo & reloading nightmare. Every week of WW II, as many munitions were used as in all of WW I. It is an extruded powder with a perfect burn speed for cartridges like 308 Winchester, 7.62mm NATO, 22-250 Remington or 257 Roberts, among other cartridges. The 223 is the most common round. A Meopta MeoStar 1.710x riflescope was mounted to ensure an optimum sight picture. imr 4166 for sale .223, .223 loading data imr 4166, .223 rem. var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; IMR4166-08: IMR 4166 8 LBS. Sounds familiar! IMR Enduron 4166 is a versatile, match-grade propellant, with the fastest burn rate in the Enduron line. IMRs press release states: IMR 4166 [has] a perfect burn speed for cartridges like the 308 Win/7.62mm NATO, 22-250 Remington and dozens more.. However, due to the super short kernels, metering is virtually as good as a spherical powder. PRBs test team also noticed other interesting trends in the data. The responsible reloader always errs on the side of caution, so I decided to stop there. For a better experience, please enable JavaScript in your browser before proceeding. I don't see any info for the A-Max though. Find load data for IMR 4198 propellant by clicking the button "Loads for this Powder".More about this powder:This fast-burning rifle powder gives outstanding performance in cartridges like the 222 Remington, 221 Fireball, 45-70, and 450 Marlin. .223 Rem. They list loads for Sperry SP and Barnes TTSX in 55gr weights. It is formulated to reduce fouling and to be stable across a wide temperature range. ga.src = ('https:' == document.location.protocol ? So if your goal is first-shot hits and you may shoot in a variety of conditions you should care about temperature stable powders. Full Member. Trail Boss is based on new technology that allows very-high loading density, good flow through powder measures, stability in severe temperature variation, and, most importantly, additional safety to the handloader. That provided two sets of velocity numbers. spitzer boat tail & imr 4166, .223 rem. So they would likely show much larger swings than what these four top-performing powders showed. _gaq.push(['_setAccount', 'UA-6323545-2']); Load data for the new IMR 4166 was taken from Hodgdons 2015 Annual reloading manual, and in increments of .3 grains or less, loads were worked up from 24.0 through 25.1 grains of IMR 4166. The folks at PrecisionRifleBlog.com meticulously loaded 6.547 Lapua ammo with each powder using some of the best equipment available.