I've never reused a primer. Too late for these, but maybe next time. Loaded up the Norma brass with my decades-old accuracy & hunting load, and brother I'm back in business. Shooting great now, just like always. It was that old work-hardened brass that was my problem. I don't know how many times I reloaded that brass, but it was a bunch and was over a long time period.
I didn't measure before and after group size, but I'll ballpark and say that worst groups with the dead brass was about 1 1/4 to 1 1/2 inches. New brass groups, which I didn't get real serious about, were somewhere in the 5/8 to 3/4 inch range. Quite a difference. Now when I shoot, the bullet hole is where I expect it to be, rather than me being surprised and wondering what the heck was going on. Next couple of days I'll see what sort of groups I can manage. I'd do it today, but the wife and the cats are a bit tense from all the noise.
I already ordered more Norma brass.