I'm mostly going to be shooting regular (supersonic) 7.62x39, but wasn't wanting to paint myself into a corner because sometimes it'll be suppressed and I wanted to try to load up some subs for plinking too.
Most of the time though, it'll be shooting supers.
Looks like Faxon is making some 1:8 twist barrels. That's probably what I'll use in this. I think they'll do ok with 220's, which is mostly what I have on hand if I use any of the 308 pills that I used to use in the 300 blk.