Home Forums Hunting & Shooting AR and Tactical Rifles New 300BO setup

When u say less blasts you meaning concussion with supers?

I’d be curious what report to the ears with subs would be on that 10.5” vs regular 55gr at 16”…

Gears spinning but a p&w griffin gp5 on a chf cl the 10.5 barrel would be cheap to shoot, ez on the ears, and be fine on a lot of pests (2 and 4 legged) with supers.

I haven't fired any subs through it yet. I need to load up a few 208 AMax over a light charge of Unique and see how it does, and sounds. It's got to be a lot less blast than a 16" 5.56.

This is a titanium Form 1 can for my AR 300 BO using 230 gran powder coated cas plain base bullets and 9 grans of H-110 at 900-1,000fps at .38" at 50 with a Thor 4 Does OK on small size hogs.



The 358 MGP and 300 BO cast and powder coated


The 358 MGP is for the bigger hogs, 500-600 pounders, it pushes a 200 RCBS at 2,500 fps and .43" at 100.

I've got 10.5" uppers in 5.56, 300BO, and 7.62x39. Here's how they stack up in my experience. These are generalizations, nothing is engraved in stone.

Ammo availability/cost - Advantage 5.56. (However, during one of the shortages, there was still plenty of 7.62x39 at a fair price, and that's when I got into that chambering)

Trajectory/effective range - Advantage 5.56 (if you like to stretch them out past 100 yards or so)

Muzzle blast - Advantage 300BO

Versatility for sub/super - Advantage 300BO

Lethality - either one, choose ammo according to desired effect.

Suppressability - Advantage 300BO