ive heard mauser actions are the strongest.....but thats just what i heard...i have no proof.....but when i was thinking of building a rifle i was going with a mauser action.....i love my mauser...its only a 3006 though....i put a few rounds through it in the few years and its always worked wonderfully.....good luck......i doubt you can go wrong with any action out there unless you do some major pounding on them and such....