Looking for a load for 300 blackout that is subsonic using 208 grain amax. Prefer a powder that is easily found on the shelves these days. It will be from a 10.5" barrel. Thanks in advance for the information.

Where's Chad?

That's exactly what I say about 300 BO... WTF.

Good luck with that, there has been no such powder around here for the past 27months.

I use AA5744 or AA1680

Imr 4227 is also an option.

DStroud & Beaubien, can y'all send me your got to load info?

Try 10.9 of AA1680 Should be close to 1000 fps. Measured out of my 16" at 1075 fps.

boonee,

Thanks for the load info.

10.1 grains of 4227. Velocity of 1002 fps

Me too. I always figured a .30-30 was plenty pokey.

When I utilize the 208A's this is exactly what I load. I have found 4227 to be very picking on metering, and occasionally I will receive a crack on my 220SMK that be running a little hot. My Unique Mircrometer Powder bar has helped on the metering.

Honestly, the powder I choose is based on the rifle first, then the weight of the bullet. The powder I use is totally different for a bolt gun than it is for an AR. And different from a 16" AR to an SBR rifle. So, it helps to know what rifle it will be fired in.

Try some H110

10.5" AR style platform. Thank y'all for the replies.