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Three possibilities:

1. The primer pockets were crimped as Eddie says, and need to be reamed. You can buy a special reamer, or use a bottom drill bit.

2. The primer pockets are okay, but the case isn't lined up exactly centered over the primer stud that holds the primer. This happens to me from time to time with my RCBS. What I do is lower the ram until I can feel the primer lightly bump up against the bottom of the case, hold it there, and spin the case in the shell holder a little with my spare hand. If the primer is a little off-center, you should feel it center itself with a soft click. Then complete the seating. It takes a little time and practice to develop the right "feel" for this process, but it works every time.

3. I include this just to be thorough. I don't really think it's happening, but....? You're trying to seat large pistol magnum primers, or large rifle primers, or even large rifle magnum primers. I did that when I first started reloading, and couldn't understand why I couldn't seat any primers until I read the labeling on the box.

Good luck.
 

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Originally posted by KLN:
CCI primers are slightly larger which exacerbates the problem. Dillon recommends CCI's not be used in their machines due to possible primer feed mechanism jams.

(snipped for brevity)

Thanks KLN, I had forgotten about that. I had the same problem with CCI primers. They were very hard to seat, and were damaged during the seating process much more often than any others I tried. The anvils fall out a lot, too.

I use Winchester exclusively, now.
 
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