There are some things I’ve done to improve priming on the LnL. The first thing is to clean up the casting on the shuttle. I took some files and removed the casting seams and a chamfer/debur tool to clean up the round opening. Then I polished all the contact points with a Dremel tool. I also keep canned air to keep any powder flakes making its way to the shell plate cleared off. Any powder can cause misalignment.
Additionally, make sure your timing is properly adjusted. Any timing errors can wreck havoc on the priming system.
Believe it or not, I think the LnL produces some of the straightest ammunition of any of the progressive presses.
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