I made that mistake with some Winchester WLPs for .45 Long Colt. I got 1 misfire out of six rounds and I am almost certain the problem is the primers.
I have struggled through 400 of them with 600 left and I can't get Winchester on the phone.
Wow, I haven't had a single misfire with WLP's, if fact, my experience with Winchester components has been very good.
I'm wondering if counterfeit primers are being sold at gun shows etc.
My workplace got stuck with a bunch of counterfeit ball bearings, they were junk.
You don't have extra light hammer springs on your revolvers, do you? Sometimes when people lighten up the springs too much, the gun can be picky about which primers are soft enough to work.