Concerning Glocks and shooting cast lead bullets out of the factory barrel, DO NOT DO IT!!!
Glock manufacturing themselfs will tell you not to do it. but you will hear from guys who say they have done it and no problems. They are not lying, but are playing a game of Russian rulette.
The rifling in the factory Glock barrels have more of a tendency to fill up with lead deposits and raise pressures to a dangeous level where something will come apart.
I am aware of one test where a glock was fired with cast bullets by a person who had access to lab pressure testing equitment. He found that after about 4-5 rounds the pressures would jump higher with each shot fired. He stopped his test after the pressures reached over 10,000 PSI above standard to avoid distroying his firearm.
There is valid reports of Glocks having severe failures while shooting cast lead bullets. some guys have been lucky in shooting cast bullets by just choosing a cast lead bullet that was of proper size and hardness where it did not lead the barrel as much as other cast bullets would.
Just because you shoot a "Hardcast" lead bullet, it will not stop leading of the barrel. If your lead bullet fails to fill the grooves and lands propertly, you will get gas blow by that will cause a lead soldiering effect on the barrel. This builds up and the restriction will shoot pressures up to a dangeous level. Stick with copper jacket bullets in the Glock factory barrel.
If you want to shoot cast lead bullets, buy a aftermarket barrel from Brownell's or Midway that has standard rifling made for shooting cast bullets.
RELH
