1000 fps is the magic number I have heard of...maybe a little faster for hardened bullets. Above that and leading can be more of a problem. I heard that if you treat the barrel with eezox you can almost eliminate the lead problem.Aquired a box of Semi wad cutters, want to load them for the .357 in 38+p...Now I`ve never loaded lead wad cutters, can I load these at +P velocities without leading problems or should I tone it down? They are pre lubed...
If the bullets you are talkin about are already graphited or treated with moly you probably won't have problems. I got some from Hornady for the 45 Colt and 45 acp that were black and they were always loaded hot for a Ruger Blackhawk. I never had any problem with leading.