Theres a fellow on AR15.com beating the hell out of his G21 just for fun, and it still works.. even has posted videos
The "case support" issue is so blown out of proportion, drives me nuts to here it repeated in a contorted way. Most pistols will kaboom with BAD ammo, brass, or reloads. Glocks are more sensative to bad brass than other guns, but not by much. The reason is the chamber and the support at 6 o'clock is at the maximum end of the industry standard, though STILL WELL WITHIN SAFE TOLERANCES.
Most pistols based on Browning's Linkless Locking System(perhaps one of the most copied locking systems of all time) that feed JHP's well will lack some case support at the feed ramp and have a looser chamber. The Glock's are a bit more than most, but that is why the Glock will feed almost any bullet type. As I said before, it still perfectly safe as long as you use good ammo, good reloads, and keep an eye on your brass.
And since .45 auto is a fairly low pressure round, you should be fine
