Re: 22-250 loads with Win. 760
When I was first developing a load for my 22-250 I tried Win760 along with several other powders (H380, Varget, Superformance, IMR4895). My personal experience with the Win was not good relative to the others - accuracy was sub-par and velocity was average. That said, I didn't get H380 to shoot great either and that is supposedly THE powder for 22-250.
Varget gave me the best results, with IMR 4895 a close second shooting 50gr blitzkings.
Hope you can get it to shoot in yours. If not, maybe "O" will sponsor a buy back in a city near you and you can trade that powder for some new sneaks or a gift card . . .