jcameron996
Well-Known Fanatic
The most important thing for any cast lead bullet is fit to bore. Gas blow by around the bullet is what causes leading. Size the bullet to be slightly larger than bore size to get a good gas seal and wide range of hardness will work fine with little or no leading regardless of the type of rifling. This is easier to accomplish with a cut rifled barrel over the polygonal rifling of the glock, but not impossible.