But that was a while ago and I would have to do a major back note search. Worked the best on the vermin, and that one I used Bullsey. And they were single shots with these loads. 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. 308' 2.690' This data is intended for subsonic use in firearms with barrel twist rates appropriate to stabilize the bullets listed. I remember just a slight bit more powder for the longer barrelīut not very much. 300 Blackout 230 GR BER TACT IMR IMR 4227. I have been loading subsonic 300 blk with 220gr. Average - 2329.86 (+/- 72.12 fps) All ejected, bolt never went back far enough to pick up the next round. Here's the range report: I fired 10 rounds of each. I have been having a problem with unburned powder in the upper and lower receiver. I had to cycle the bolt by hand, using the charging handle. The rifle is an 8in Aero upper with a regular gas block + rugged razor suppressor. Barrel is 9' Delta Company Arms with PRI adjustable gas block. 2.210 Cycled & locked bolt open with CAR stock and Enidine buffer. I have used Dupont/IMR PB with success in very light loads for the 223. I have been trying to get some IMR 4227 to work for my 300 blackout AR for a few months now. 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. I predict ignition and burn will be erratic thus velocities will be also. 16inch was a little sharper report with a shorter barrel. FWIW It is my considered opinion that you will not be happy with 4227 for anything near subsonic loads in your 223's. In rifles, this powder delivers excellent velocity and accuracy in such cartridges as the 22 Hornet and 221 Fireball. If a pistol says Magnum, IMR 4227 is the choice for true magnum velocities and performance. 55grain Hornady SX seemed to work the best as they are short and don't need as fast a twist. IMR 4227 is a medium burn speed, magnum pistol propellant. I worked with this a few years ago in a couple Ar's. These subsonic loads are what my 8' suppressed pistol likes. 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" 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. 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. Boss Improved Military Rifle IMR 4198 Improved Military Rifle IMR 4227 Ramshot. if your going to run a suppressor always make sure to check for stability/keyholing before using it with your can. Hornady Subsonic Ammunition 300 AAC Blackout 190 Other features: Impact. 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. I think wou can still find that bullet.Hodgdon has some sub load data. I remember just a slight bit more powder for the longer barrelīut not very much. 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. Important Information: Do not exceed the loads displayed in the reloaders guide.
In rifles this powder delivers excellent velocity and accuracy in such cartridges as the 22 Hornet and 221 Fireball. If it says Magnum, IMR 4227 is the choice for true magnum velocities and performance. the shorter the bullet the better as at subsonic velocities especially in a 1:9 and slower twist stability can become an issue. is the Magnum Pistol Powder in the IMR lineup. if your going to run a suppressor always make sure to check for stability/keyholing before using it with your can.
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