From what I understand, the 10.3's run about 8500-10,000 rounds and then 2-3 of the baffles are severely erroded. The 14.5's according to what I've read run to life at about 35,000-45,000 rounds with end of life being due to severe leading to the point that volume is pretty much gone. That's of course based on military exposed lead base ammunition, so if you were to run copper based that might extend or change those numbers.