03-23-2018, 01:08 AM
Klem Wrote:Yes, I am aware of the obvious function of the retaining pins, which is to retain the case while it spins at speed.
What I am referring to is the other role of the retaining pin, which is to index the case at the edge of the bottom plate. I only have one Dillon plate which is 9mm. No doubt the diameters of plates vary depending on calibre. Given the holes the retaining pins sit in are fixed their button diameters will be different diameters to account for the different diameter bottom plates. This is how Dillon solves manufacturer-induced run out in a generic machine.
Your practise of raising the ram and screwing in the die's locking nut with a case in it might also help.
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As I mentioned earlier, Dillon specifically instructs to tighten dies with cases in every station. Much the same as a single stage, the cases float in the shell plate so as long as the ram is square to the die there shouldn't be any additional runout. It's actually surprising how good the ammo coming out of a Dillon progressive press can be. There is a funnel die that can be substituted for the thrower so you can drop trickled charges one case at a time too.