Briman

For some Glocks over 9mm, I understand that there is a serious lack of casehead support, you shoot and the brass stretches in areas around the casehead- sort of like a rifle with excesive headspace, but in a different direction.
When you resize the brass, you iron the part of the brass back to its original dimension, but hte brass will be thinner and weaker. If you reload to well below maximum pressures and opnly reload the brass a few times, you might be ok, but if you are going for maximum velocities, you are going to eventually rupture a case.

You can't/shouldn't shoot cast lead in a Glock.


If you want to save money on ammo by reloading, I don't see the point with a Glock, I would rather spend a few hundred more for a better pistol and shoot cast lead at much cheaper cost with a much better chance of the dang thing blowing up on you.