I'm new to casting I shot my first 20 bullets that I cast for my 30/30 lubed and sized .309 178gn flat point 15 grains adi 2207 powder. And when I cleaned my rifle after use I noticed no difference in how dirty the barrel was to firing jacked rounds.also I did recover one of the bullets and the base of it was still nice and round and the head of it was nicely mushroomed with no breakup of the lead.