If you notice the indentations in your primers while the finished rounds are dropping from the press, there's an easy way to check the primer stem:
Advance the shell plate, as usual.
Leave station 1 empty.
Press forward on the handle, as if you were priming.
It makes the primer seating stem visible, and allows easy cleaning.
If the primer seating stem is not dirty, check the other stations for debris on the ram platform. Lots of different contaminants like to find a way to get stuck to the platform. Some of the most common particles are carbon chunks, lead shavings, brass shavings, and tumbler media.
Lastly... make sure you are using the large primer seating stem for large primers. Using the small stem will leave dimples, crescents, and other funky shapes.
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Don't even try it. It's even worse than the internet would lead you to believe.
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