Different calibers , of course, wear barrels differently. Generally speaking the .22 centerfire barrels running bullets at 4000 fps or there abouts eat barrels pretty fast but barrels are eaten up by heat. Hotter powders, rate of fire and faster speeds. If you’re talking about long range rifles like 6mm or 6.5 they’re usually changed in the 1800-2200 round range where the older slower and more ballistically challenged .308 will last twice as long or longer. If you’re talking about pistol barrels or say .22 rimfire barrels then poor maintenance procedures destroys way more of them than wear.