A couple of years ago I had some misfires in a rifle (two I believe) that both fired in the second attempt and since then I never had any problems with hard primers and never thought about it again. I just got a new rifle and did some handloads with new primers just out of the store and got multiple misfires!!! None of them fired on a second attempt and I even tried three times on one. Just about every third one was a complete dud!!! Since the rifle was new I didn't know if it was the rifle itself or bad components so I went to the gunsmith and he said don't even bring the rifle in the door because this is happening regularly. They have had regular cases of bad primers so often that he didn't bat an eye when I told him. I then switched to Federal primers and sure enough the rifle is just fine.
I am consumately clean and neat in my handloading practices and have never had a problem in over 25 years of loading. Anyone else experiencing this problem?