It has been years since I used Winchester powders but the 2 things I do remember about it are 1) in my guns, I was about 50 FPS faster than what the reloading manual said I should be when I shot across the chronograph 2) it was a dirty powder leaving lots of residue in the barrel.
I switched to Clays and never looked back. However, in this time if I could get a good deal on the Winchester stuff, I would not turn my nose up at it, but I would chrono my loads to make sure I was getting what I thought I was suppose to get FPS wise.