But that was a while ago and I would have to do a major back note search. but now I'm going to lengthen OAL at to 2.100' and stay at 10.1 gr IMR 4227 and see. Back then, most sources listed what many twenty-first-century handloaders would consider stupidly inadequate velocities, because companies listed every suitable powder. Worked the best on the vermin, and that one I used Bullsey. Moderators: gds, bakerjw, renegade, bamachem. Other long-time IMR powders also work fine for reduced loads, including IMR-4227, IMR-4198 and IMR-3031, which were used a lot back when 10 zillion powders weren’t available. Barrel is 9' Delta Company Arms with PRI adjustable gas block. SKU: N/A Category: Powders Tags: 357 mag imr 4227 powder, 44 magnum imr 4227 powder, charge weight for 308 with imr 4227 powder, dupont imr 4227 smokeless powder, imr 4227 a good powder for, imr 4227 not working in savage smokeless powder muzzleloader, imr 4227 powder. 2.210 Cycled & locked bolt open with CAR stock and Enidine buffer. And they were single shots with these loads. 208 Hornady AMAX with IMR 4227 10.0 grains Need to chrono but appears subsonic FPS 000 average (gas port 75 open) C.O.A.L. Tried 2 other powders that were fast and I think Bullsey was one of then but The 1-7 shot a little better and was harder on the vermin. Vmax style bullets were two long and did not shoot as well. IMR 8208 XBR Smokeless Reloading Powder is perfect for. I remember just a slight bit more powder for the longer barrelīut not very much. IMR 8208 XBR Powder is a super short-grained, extruded powder that meters very well. 16inch was a little sharper report with a shorter barrel. 55grain Hornady SX seemed to work the best as they are short and don't need as fast a twist. I worked with this a few years ago in a couple Ar's. i'd probably bump them up a few 10th's and work down but it doesn't mention it so YMMVĬase: Winchester Twist: 1:12" Primer: Winchester SR, Small Rifle Barrel Length: 24" Trim Length: 1.750" I have used Dupont/IMR PB with success in very light loads for the 223. I predict ignition and burn will be erratic thus velocities will be also. These loads are very nice and quiet (TO ME) without a suppressor, through my Rem7615 pump 223/5.56. I kept increasing the charge until it reached the IMR recommended starting charge of 30 less than case capacity BELOW BULLET BASE, with only 3 or 4 more squibs to push out. you may find that pistol primers will give better ignition and lower es/sd but i'd use the 400's if thats all you got. FWIW It is my considered opinion that you will not be happy with 4227 for anything near subsonic loads in your 223's. With a properly sized wooden dowel it took only a moment to push out.
With subs start high and work down till below the speed of sound. the shorter the bullet the better as at subsonic velocities especially in a 1:9 and slower twist stability can become an issue. if your going to run a suppressor always make sure to check for stability/keyholing before using it with your can. also i'd use the 55gr soft point assuming it's a flat base. want to say trail boss and titegroup were the powders used. Hodgdon produced the following load data using a 16 barrel with a 1:8 barrel twist rate, Hornady cases trimmed to 1.363, and Remington 7 1/2 Small Rifle Magnum primers. Thanks a lot, y'all have been quite helpful so far.Hodgdon has some sub load data. IMR 4227 is suitable for supersonic and subsonic loads. 308' 2.690' This data is intended for subsonic use in firearms with barrel twist rates appropriate to stabilize the bullets listed. Last item, has anyone used the Vihtavuori N110 or any of the other faster burning powders listed on the burn rate chart from a few comments ago? 300 Blackout 230 GR BER TACT IMR IMR 4227. Just picked up a can of this stuff (CFE BLK) tonight and will load a few tomorrow. It seems to have numbers very similar to Accurate 1680. Average - 2329.86 (+/- 72.12 fps) All ejected, bolt never went back far enough to pick up the next round.
300 AAC Blackout 205 Grain Subsonic Hunting Tipped Brass Cased Centerfire. Here's the range report: I fired 10 rounds of each. We have some IMR 4227 and Federal gold match AR small rifle primers to load. Next item, I have seen a lot of this newer powder CFE BLK by Hodgdon. I had to cycle the bolt by hand, using the charging handle. In order to verify this, I have purchased a chronograph as one of you suggested.Thanks. Take that times 10 and I should be preparing loads for 110 feet per second faster than what i will actually be seeing in my back yard. The test barrel minus the rattler barrel is about eleven inches. One source stated that for every 1 inch of barrel shorter than the 16 inch test barrel, the re-loader should expect to see about a drop of approximately 10 feet per second. I have not found any load data charts for the Rattler's 5.5 inch barrel. Along with your comments, my research has turned over some new (to me) information.
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