that's interesting since that's not even what the manufactures say and I have shot some so called hard cast that were rated at a brinnel hardness of 18 that leaded rifle and handgun barrels from velocities of 1250 to 1700fps. The same bullets when brought down to around 1000fps quit leading. I've also used standard lead bullets and those started leading around 800-900fps and these were tried in half a dozen or more firearms so it wasn't a rough barrel.

I won't be wronged. I won't be insulted. I won't be laid a-hand on. I don't do these things to other people, and I require the same from them. John Wayne-The Shootist