I haven't loaded enough rifle ammo to comment from experience, but people I have talked to have had the same experiences with Winchester rifle brass.
I see a little talk about IPSC, If your shooting .40 for that game, use 180 grain bullets and stay away from Winchester 231. Its a great powder for .45acp but its to slow for .40, your loads will be all over the place (not consistent) and its tough to make major (temp affects)
For IPSC bullets and practice I loved Ranier Balistics copper washed. I've been out of the game for a couple of years, but I was VERY involved for about 10 years before that.
Anyone want to go shoot a match, let me know.
Steve