I have shot the 243 AI since the mid 80's. Today, I would go the 6 Creed, and Stick is spot on. Get the toughest brass there is....pick. Spend some time on throat geometry design.
Many wonder what the 243 AI will do. I hunted coyotes with many 243 AI's. 70g Nosler ballistic tips at 3800 shooting tiny bug holes is normal, not the exception...zero freebore reamer left room in the Remington magazines, barrel set back at 1700 rounds if you use ball powder, otherwise, no.
I fire formed killing stuff, 70g Noslers at 3700.
