Best rate of twist for cast .300 black out?

Well, I'll start off by apologizing if this is the wrong forum, but after reading on rpm limits, gas checks, and powder coating I figure I could use all the help I can get.I just bought a tikka t3x in .223 and I'm wanting to swap the barrel. I've been reloading for years and would like to get into casting. Low pressure subsonics sound like a fun round to tinker around with different alloys, molds etc. For a 16 inch barrel what twist rate would you guys recommend for a 200-250 cast, possibly powdercoated bullet?

Welcome on your first posting
I would use a 350 Legend with .358 barrel
Lyman 358315 or 358318, or 335009.
Twist rate would be 1 in 14 depending on elevation
Velocity from 1200 to 1000 also depending on elevation
https://www.reddit.com/r/350Legend/c...h_twist_rates/

Again, welcome
Mike

p.s. same for Blackout but harder to get that heavy of bullet in a .308 bore

https://www.ar15.com/forums/ar-15/Wh...ts-/16-777568/

My 16” AR had 1:9 twist, rest are all short barrels to match pistol gas tube.
You shouldn’t have any trouble in a bolt gun except for mag length restriction unless single loaded.
300BLK is optimal for heavy bullets subsonic suppressed.