30-30 barrels
Tom,
As with all rifles the hotter the ammo the quicker the wear on the barrel. I've been shooting Speer 180 FN at about 2300 fps in my Marlin 35 Rem since 1971. This is my hunting rifle and only gets a hundred rounds a year. The barrel will last as long as I do. My wife shoots 130gr cast lead from her 30-30 at about 1800 fps. The barrel shows no wear, and she could shoot a thousand rounds a year with the same results. The low operating pressures of these cartridges extend barrel life when compared to something like the 7mm Rem Mag or even hotter rounds like the 30/378.