There are several of us at our club who have been loading with Wolf 209's since July without any duds, and that's about 5 to 6 thousand shells. They are definitely on the cooler end of the primer spectrum, whereas I see some afterburn out of the action of my Teknys autoloader when using the Wolf primer versus none when using the Winchester. I will tell you the target doesn't know the difference when it blows up, and the report is not inconsistent with the Wolf product. I have loaded some shells 2 or 3 times with the Wolf primer, and have not noticed the primer pocket being stretched any larger than with either a Remington or a Winchester 209. For almost half the cost of the latter mentioned primers, I will continue to use the Wolf.