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The frankenAR-15 that could

That's crazy for a rack-grade barrel. Congrats.

I'm seeing service rifle loads in Hornady' 8th Edition for .223 that push the 80gr A-MAX single-loaded to 2750fps, loaded to 2.390" COL.

What max COL can you load to, and have you looked at IMR 4007 SSC?

Their Varget load maxed out at 2600fps for the 80gr at 2.390".