I have had some issues with my Lyman primer as well, but the culprit was not the tool itself as I have finally discovered. My issue was the shell holder. When using the RCBS shell holder for the 300 WSM I had issues of the primer not seating deep enough and having a heck of a time with removal and with depriming. When I switched to the Redding shell holder all the issues went away. I have had the RCBS shell holder for over 15 years. Until about 3 years ago I also used the RCBS hand primer exclusively, until it broke. I forgot about the RCBS warranty, chunked it and replaced it with the Lyman. So valuable lesson learned by me. Still not sure what the issue is with that RCBS shell holder but I'll be making some measurements and seeing if I see something.
