There is some guy (glockmeister I think) that sells you a barrel for your glock that allows you to shoot lead bullets as it has the standard rifling.
H&K has the same Polygonial (spelling?) rifling in their barrels as well.
I have used SWC LEAD bullets, but I've always "wiped the bore" out with a FMJ at the bottom of the magazine.
Have NOT had any troubles although I have since given up the practice as I have bought a CCW piece that does NOT have that problem.
HTH
Bob