Well, I like most of the replies that say "Keep it," but I also know that some guns can be picky about what ammo they like, and there is no rhyme or reason to why. Although most of my shooting days were spent with all ammo and all guns working (with the exception of a Model 61 which apparently liked only Remington HSHP), in the last ten years I have both received free ammo which worked great for me (but not for the guy who gave it to me), and given away ammo which did not. The recipient had no problems with the ammo.
You seem to know what you're talking about. Just sell it to friends for what you paid for it, or, if the going price is higher, a little more. I guarantee you they won't buy it if the price is too high. More likely, they'll be glad to get it.