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I am currently running a LNL AP, but the principal is the same. Initially I also had some issues, not with primers seating high, but the primer shuttle sticking and not delivering a primer at all. Powder would get everywhere... what a mess!
Anyway, if I knew then what I know now, I would have quickly realized that there was something wrong with the primer feed operations. You should feel that primer seat into the case when you push back on the handle. No resistance or too much resistance indicates a problem. Take it slow and check your finished rounds diligently until you get the feel for when it's running right or not. I was just running mine the other day and started having problems with the case lining up withe sizing die.... after it happened twice I stopped and started checking things out. Turned out the shell plate had worked loose slightly... just enough to cause a problem. I tightened the bolt a turn and a half, and presto, everything was glorious again. It takes time, and there is a learning curve with all of these machines.
Anyway, if I knew then what I know now, I would have quickly realized that there was something wrong with the primer feed operations. You should feel that primer seat into the case when you push back on the handle. No resistance or too much resistance indicates a problem. Take it slow and check your finished rounds diligently until you get the feel for when it's running right or not. I was just running mine the other day and started having problems with the case lining up withe sizing die.... after it happened twice I stopped and started checking things out. Turned out the shell plate had worked loose slightly... just enough to cause a problem. I tightened the bolt a turn and a half, and presto, everything was glorious again. It takes time, and there is a learning curve with all of these machines.