I've been using Winchester primers for years, the only problem I ever had was a pierced primer in my 17 Rem, it is still unknown what caused it, no other cartridge with the same load and primer lot ever did it. A hunting buddy suggested a piece of cleaning cloth probably caused it, I had just cleaned the bore and it was the first shot afterwards.
I can tell you for sure, the Winchester magnum primers are hotter than any other brand I've tested. I found Federal primers softer than Winchester primers.
Cheers.
