I have used with complete satisification the Lee mold that throws a 100 grain flat base bullet #90301, sized to .310, and lubed with my own lube. Leading? Nope I get none, bright shinney barrel just like a .22 using quality ammo. Gas system problems? Not after 7 years and 1,000's of rounds.
Maybe I'm just a Good Little Elf.
Beat me to it kraig.