Optimal load for 300 Blackout

[GunFunZS]

168 grain Polymer tipped Hornady
8 grains of IMR 4227
2.283 OAL

It is a subsonic load but shoots extremely well for me. I will be adding more subsonic loads as I can.

Does this cycle an AR, or is it for one of your manual actions?

[Dolomite_Supafly]

168 grain Polymer tipped Hornady
8 grains of IMR 4227
2.283 OAL

It is a subsonic load but shoots extremely well for me. I will be adding more subsonic loads as I can.

Does this cycle an AR, or is it for one of your manual actions?

No idea, I shoot 99% of my stuff from single shots. I put together and AR for a few days then tore it back down because ARs are LOUD.

Depending on barrel length and gas system it should cycle.

BTW, it will not feed from an AR magazine. OAL is too long.

[dellet]

168 grain Polymer tipped Hornady
8 grains of IMR 4227
2.283 OAL

It is a subsonic load but shoots extremely well for me. I will be adding more subsonic loads as I can.

Does this cycle an AR, or is it for one of your manual actions?

No idea, I shoot 99% of my stuff from single shots. I put together and AR for a few days then tore it back down because ARs are LOUD.

Depending on barrel length and gas system it should cycle.

BTW, it will not feed from an AR magazine. OAL is too long.

HK

[GunFunZS]

Does this cycle an AR, or is it for one of your manual actions?

No idea, I shoot 99% of my stuff from single shots. I put together and AR for a few days then tore it back down because ARs are LOUD.

Depending on barrel length and gas system it should cycle.

BTW, it will not feed from an AR magazine. OAL is too long.

HK

What does HK mean in this context? Use an HK mag?

[dellet]

No idea, I shoot 99% of my stuff from single shots. I put together and AR for a few days then tore it back down because ARs are LOUD.

Depending on barrel length and gas system it should cycle.

BTW, it will not feed from an AR magazine. OAL is too long.

HK

What does HK mean in this context? Use an HK mag?

Steel mags in general, HK in particular, will allow a longer length than plastic. Same external dimensions, thinner walls, leaves more room inside.

That round will likely fit, bullet profile on the guide rib may or may not cause a feeding issue. It would be a try and see.