I’ve owned 3 280AI’s . First two rechambered 280 rem. Rem 700 and FN Mauser, neither shot outstanding so when Kimber brought the ss Montana out in the 280 AI I got one, and it luckily shoots well. All I shoot on it are 140 grain nosler accubonds with good success on deer and elk . Hot load of reloader 19. Mine is not ported and recoil is tolerable. Weight makes for
a easy carry. Get nosler brass,don’t mess around reforming standard 280.