Welcome to INGO. Yep, ammo can't be returned. A couple of possible options for you would be to take it to the next gun show in Seymour, IN on Sept. 19 & 20 and sell it or trade it for ammo you need. The second possible option is to buy a gun in .45 Long Colt caliber at the gun show and shoot up the rounds.Like everyone, I've been looking everywhere for ammo. All of the shelves in my area are empty and all of my online sources are out of stock. For some reason, I happened on the Sig site and they had 45 Colt in the blemished column. I ordered and received two boxes of 45 Colt. Unfortunately, it's 45 Long Colt. I'm almost positive I can't return it.