Barrel twist and other advice needed
I'm looking to build a SBR. We're an 07/02 so we can go ahead with the work at will, but we're unsure what barrel length is best with what twist rates, etc...
I'm thinking a 10.5" barrel is what we want, but if the collective thinks we can go with shorter (8.5" maybe) we would probably do that.
My questions are this:
What would be the best twist rate in 5.56/223 for a 10.5 and 8.5" barrel?
What would be the best twist rate in a 300blackout in the 10.5 and 8.5" barrels.
and finally, is the 8.5" barrel in either caliber going to be so short it kills velocity and affects accuracy because of it?