I simply just stop before getting near compression and my ES remains acceptable while hitting the high max speeds of the caliber. I still achieve high max speeds like 2400fps and just over without having to cram in so much powder that I get to the big ES issue. When I started loading 300BLK there was so little load info out there and I was new to reloading so I went with the most pressure forgiving super powder so I didn't blow myself up. Lil'Gun is very forgiving with pressure so you can load more and get higher FPS. I don't doubt one bit that they bumped up the load grains and max FPS. Yes you can pack more powder in and get a higher Max FPS but if you chrony 5 rounds you might have something ridiculous like 2465fps and then 2250fps back to back. Velocities range from 2,200 to 2,350 fps, combined with the bullet weight and expansion characteristics delivering a very effective performance on game up to and including mule deer. I can tell you that my experience is that once near compressed or compressed in 300BLK the Extreme Spread (ES) can get great. 300 Blackout is loaded with 110- to 125-grain bullets for hunting. These are not as common now as they once were, but an AR-15 carrier doesn’t have as long of a full-profile section on its body as does the USGI-standard M16-format. In keeping with this motif, an AR-15-style bolt carrier works best with subsonic. Best load data for subsonic 300 Blackout 300 blackout subsonic load data By af220wa in Rifle/Shotgun af220wa 53 Posted I'm starting to load 300 blackout and looking for the best bullet weight, powder type/grains for sub sonic suppressed. All of my super loads are done with Lil'Gun. Most subsonic Blackout ammo uses a bullet in the 200-grain range, and, of course. 308 but my findings show the opposite.Lil'Gun is my super powder. My previous thought was with the low recoil of this caliber the action would not be affected as drastically as with the. I had taken the time to reinforce the hogue and felt this to be a worthwhile effort until todays range trip. I am satisfied with todays testing and feel more confident knowing the rifle will shoot I just need to locate another take off HS Precision or BC Medalist stock. It is my finding that errors in shooters form, handloading regiment, and poor equipment will magnify with subsonic loads. 300 Whisper and results have been good with both platforms. 300 AAC Blackout is likely the most versatile cartridge for the AR-15 platform. Today I changed the hogue stock with my HS that was on my 5R and tried again with the same factory Corbon and group shot a solid 3/4" 100. Yesterday I shot a 100 yard group with factory Corbon subs with 220 SMKs and shot a 2" group. I have used diffirent powder and combos of bullets. I have been extremely aggravated with the performance of sub loads in my ACC-SD 300 blackout. Any suggestions for heavier bullet sub loads? Thanks for any help Using the same brass, Forster dies, and I have several pounds of different powders to try. New barrel 1-8 22 inch long no taper 90* crown I haven’t shot anything over 178 grain matchkings in my ar10 so I’m not sure what a good bullet would be that can double as a subsonic round in the 300 as well as a nice precision round for the ar10. Old barrel 1-10 16 inch long no taper 11* crown I have not loaded for either of these rifles yet but from what I can tell a lot of 300blk sub reloaders like to use 200-220 grain projectiles. It's about making a rifle do what I want it to. This is not about what I will use it for or why I want to get groups smaller. Things I have tried are giving me around 1 inch groups the best being just a bit under. My issue is now I put a new barrel on with a faster twist to go subsonic and I am looking for advise on reaching a comparable level of accuracy with subsonic loads using heavy bullets 175-240 grains. 3-.4 with standard off the shelf bullets. 35 for five shots when using high end bullets and. I have had decent luck with supersonic loads averaging between. I have been working very hard with 300 blackout savage bolt gun over the last year to wring all the accuracy I can out of* this little cartridge.
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