The topic was hunting rifles so 30-06, 308, or other rounds for bigger game. The guy told me the millitary rifle would last longer as they are designed to shoot more rounds so over time they are a better option.
Thanks for the info I will keep researching.
I would go along with the idea of military calibers will last longer, but not military rifles.
If you look at the 308. Depending on your idea of acceptable accuracy the barrel cal last 10,000 rounds.
If you look at somthing like the 223wssm, 6.5x284, etc the barrel may only last 1000 rds because your pushing the bullets so much harder. The military typically doesnt push their rounds as hard as some competition shooters, but they shoot at a faster rate of fire so that would come into play aswell