300 Blackout 8" 208gr Amax Subsonic loads?

[Tyler Kemp]

Hi everyone, trying to help my buddy out who just built an SBR 300 Blackout. We can't find any 1680 or 5744, and are searching for other powders that will offer maximum accuracy and minimal velocity deviation. These will be in an AR platform.

Thanks!

 

[gaphighpower]

My go-to load...

As always, YMMV

 

[Huskerhunter]

I've had decent luck with 200gr Sierra's and H4198 since I had some lying around and Trail Boss is unobtanium.

 

[jkonzal]

I would recommend trying H4198 also. I haven't tried it in a gas gun, but it works well in a bolt gun.

 

[Huskerhunter]

I would recommend trying H4198 also. I haven't tried it in a gas gun, but it works well in a bolt gun.

I'm running mine in a gas gun but with a side charger, custom adjustable block and tuned buffer so mine cycles fine. YMMV of course!


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[timelinex]

Tag.

 

[Tyler Kemp]

Any more?

I was shooting groups averaging about an inch with the Hornady 208 Amax loads.