[ExSoldier]

In a Glock, the most common ammo related issues concern using lead instead of jacketed ammo. The octagonal barrel will shave lead dramatically causing barrel obstructions and increasing chamber pressure way beyond factory specs. I have seen the results of this several times and the accompanying noise is a KA-BOOM! A friend of mine nearly lost the fingers on his hand trying to save a few dollars on ammo. Trauma teaches.

[AnAmericanMother]

There's also a good deal of variation in the hardness of the lead. Soft lead bullets would make a mess of a Glock barrel in short order.

We shoot cowboy action, and cast wheelweights are just exactly right for that application - doesn't lead the barrels badly, doesn't splatter a lot, good accuracy at that distance.

A friend of a friend runs a small tire shop out in the country and doesn't generate enough discarded wheelweights to interest the recyclers in driving out to visit him. So he saves them in five gallon plastic buckets, and our friend picks them up. He does serious black powder target rifle, and the wheelweights don't work for him. He buys his lead alloy from a custom metals supplier.