Barrel life and cost in general is why I chose .308. I got into this when I was in college. I had a good job so I could afford a hobby, but I still had to be smart with where I spent my time and money. I didn't want to worry about barrel life or spend a bunch of time handloading for practice or fireforming brass.Barrels are actually one of the “expensive” items.
2500 rounds is a fair average between most 6mm (obviously there’s arguments for more and less round count depending on the cartridge and speed).
$700 is about average ($350 for blank and $350 for chambering).
That’s $0.28 per shot. Which is only eclipsed by bullet prices.
If you shoot any decent amount of rounds per year, bullets and barrels are the expensive part. Everything else is a one time expense and if you buy quality equipment, it usually retains a significant amount of resale value. Even at 50% resale, it’s vastly cheaper than bullets and barrels in the long run.
I bought a 308 thinking that I could buy cheap factory ammo to practice with, reload that brass for matches, and use the same barrel for years. It worked out well for the most part. I placed well enough that I was able to pick up certs for bags, brass, powder, etc off the prize table at the two day matches I shot.
I graduated a few years ago and I'm still using that barrel. At this point it's hard to justify switching to a different caliber. My 308 barrel is probably past it's prime but I think I'm going to buy another 308 barrel. There's a competitive group of Tac shooters in my region and we have a blast competing for top Tac.