I shoot a 500gn gaschecked quenched WW boolit at 2150fps out of my 470 NE and don't have a problem with leading. I"m loading RL-15. I've been useing Javalina lube, but intend to try some FWFL when life settles down abit. I got the mold from www.mountainmolds.com and it does a great job.