My dad had a batch of Winchester 209 primers that were not very good. He also had a misfire on a nice buck. After that we went to the range and snapped a few primers off and they were inconsistent in power. Most were good but a couple were very weak. I then tried them in my muzzleloader and I couldn't even get the action closed with them in there. Something was off with their size.

I have been shooting the Remington Kleanbore primers and have not had any issues. My dad also switched over and has not had any issues since.