As I was unloading the magazine, I noticed 4 of the cartridges looked significantly shorter than the other...what the heck? Setback? What's going on here? (All clean versions of what went through my mind.) I picked up a couple side-by-side...the cases were different lengths. Looking on the bottom I see "G.A.P." along with the "WIN" stamp. I don't recall a Seseme Street moment at any time in the past where "one of these things is not like the other" when I was at the range. So I don't know if I've actually shot any of this in my pistol. I'll have to take a look at my stash that I've got opened and see if there is a mix in there somewhere. Nor do I buy .45 GAP...and the only other person I've been shooting with doesn't own or buy and .45 GAP. So I'm somewhat at a loss as to where this came from outside of perchance being mixed in a box of my usual ammo. I did have a mix of some ammo a long time ago from a cousin...but that has been long gone now...years past. I've not seen anything that says shooting this in my standard .45ACP pistol will do any harm. Do any of you have any input on this?