Thought I would share my experience with barrel life 6.5mm Shooting NRA long range high-power. 6.5x55 96 Mauser military barrel lasted about 3,500 rounds shooting loads of 140gr at 2,750 fps; 6.5x284 shooting 142gr at 2,920 fps (40X action) lasted 1,150 rounds.; 6.5x55 Shilen barrel (same 40X...