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?