At the range today I was using .40 caliber Blazer/CCI with the aluminum cases. After about 300 rounds with 6 different magazines, the Glock 23 would not go back into full battery upon ejecting the spent cases. This only happened when I used the short trigger reset method, i.e. doing double taps. If I let the trigger go all the way forward between each shot, there was no problem. I have used this ammo in the past without problems. It seems as if maybe the aluminum cases are getting hot while sitting in the warm gun and the heat is having some effect on the round and preventing the gun from going back into battery after firing/ejecting??? Also, when the problem occured, I would have to manually pull the slide back about 3/4 of an inch to reset the trigger each time, to be able to fire again without the gun just going "click." Any ideas??? Anyone??? THANKS! EDIT: When I switched to my carry ammo (Winchester RA40T's), I had no problems... so it must be the ammo, right??? And of course I just ordered 1,000 rounds of the aluminum CCI/Blazer that will be showing up at my house tomorrow!