I've owned a 460 and 4 378 over the years and had no problems with them. Just be sure to have a muzzle break on them. Currently, I have a 338/378 and love it. My 40+ year old 300 has never let me down either. The only problem I have HEARD of is an occasional broken extractor. It is rather small for the big cases. By the way, I doubt if more than 3 of those recoil lugs are in actual contact at any one time...but the others are there if needed.