I shot plenty of cast bullets in my M19 when I had it. They were cast out of straight wheelweights and lubed with Alox, and I cleaned it regularly. Never had an issue, and some of that ammo was loaded pretty warm. I never could warm up to the thing, though, and sold it after about six months. I liked my HiPower better. And a Tanfoglio, or anything else. I just didn't like the thing.
But it shot okay, and never caused any issues I knew of.
