Interesting, Jim. If mine had throat erosion, it did not show in the groups it was capable of shooting.

Even the home made bullets using sized down & shortened .250 Savage and .30/06 cases, along with merely shortened, lead filled .35 Rem and rim-trimmed .303 cases with bullets to 480gr. shot into 1 1/2" at 100 yards. I was only driving those just over 2,000fps - some I annealed, some I didn't.

15,000 is a lot more shooting than most people put through their .458's and that was only my first one. My second one finished off the cartilage in my shoulder so I down-graded in bore sizes to .375's and 9.3's- both favourites at this time.