i have four glocks, 19,21,23;26. i was at first worried about shooting lead bullets through my 21sf with all the talk of doom & gloom. i started off slow & kept an eye out for any signs of leading or other problems. i now shoot lead thought my 21 weekly. here's the best part it loves lead bullets.groups at 25 yards are well under 2''. loves bullet 68, 200 grains with 4.8 bullseye. tried 4.4 but it barely cycled the gun. my theory is the 45 doesn't go fast enough to lead even in glocks. i've shot three types of lead bullets. speer dry lubed 200 swc shoots great but i can't get it to feed 100%, it has a very short nose.