Originally Posted by
country gent
Theres a lot of factors affecting throat erosion and barrel wear. By far the worst on a barrel is a improperly used cleaning rod. short necked cases with shallower shoulder angles are said to promote faster throat erosion. Large charges of powder with small bore bullets. I had an accuracy gunsmith once tell me 220 swift and 22-250 with full bore jacketed loads barrel optimum life was 600-900 rds before it leveled off and started dropping.
With cast bullets and the lighter powder charges, I suspect round counts will be surprisingly high. The old sharps, rollers, ballards, and High walls that shot black powder and soft lead bullets or paper patched bullets all its life still have pretty decent barrels on them. Also look at the round count most get from the mildest lead bullet round we shoot the 22 lr. very small powder charge. light bullet. These are counted in the 10s of thousands of rounds with proper care and cleaning.