SSSHHHH! Super Quiet Sub-Sonic Load

[PAwhitetailbowhunter]

I shot 5 through the Chrono and shot 5 for groups at 50 yards. Super Quite and dead on accurate @ 50. If you are shooting 300 Blk and can get your hands on Trail Boss, this is the best load I have found out of my single shot H&R.


Created: 03/28/16 11:14 AM
Description: 300 blackout H&R Handi Spec war 7.62
Notes 1: 5.0 gr Trailboss 125gr Speer TNT
Notes 2: OAL 2.090" Fed 205 primer
Distance to Chrono(FT): 10.00
Ballistic Coefficient: 0.326
Bullet Weight(gr): 125.00
Temp: 0 °F
BP: 0.00 inHg
# FPS FT-LBS PF
5 1040 300.26 130.00
4 1023 290.52 127.88
3 1037 298.53 129.62
2 1030 294.51 128.75
1 1058 310.74 132.25
Average: 1037.6 FPS
SD: 13.2 FPS
Min: 1023 FPS
Max: 1058 FPS
Spread: 35 FPS
Shot/sec: 0.1
True MV: 1040 FPS

[NathanB]

You're using a 125 for subs? I'm shooting all 200 plus for mine over a1680

[daschnoz]

You're loosing energy with the low speed. To compensate, go with a heavier bullet to regain some of the lost energy. Don't worry about keyholes should the longer/heavier bullets get unstable in flight. While a tumble will send a super sonic bullet off to nobody-fucking-knows, subsonic bullets tend to fly pretty much where you want them to regardless of how unstable the bullet gets during flight.

[PAwhitetailbowhunter]

You're using a 125 for subs? I'm shooting all 200 plus for mine over a1680

Nate, these are being shot out of a Single Shot H&R Handi Rifle. These loads would not cycle in an AR. I have loaded as light as 90 grain Hornady XTP 30 Cal bullets but still need to experiment to get the load correct for the 90 grainers. I also load up the 208 grain Amax and the 220 Grain Sierras with A1680, IMR 4198, I have IMR 4227 but have not tried it with heavy subs yet.