I am new to this forum and need some advise. Earlier this year I bought a Glock 19 as the wife's home defense weapon because it fit hand so well. We have shot about 150 - 200 rounds through it ( mostly Winchester white box) without a single problem and I have cleaned it since. This weekend we shot Hornady Critical Defense 115gr and out of 24 rounds it failed to feed 5 times. Needless to say, I was shocked and the wife's confidence in her weapon was shaken a bit. I helped that by opening a 100rd box of the Winchester and sailed through it without hitch. What could explain our problems? Bad lot of ammo, bad magazine or something I am not thinking of?