Thread: White River Primers - Any misfire issues?

Originally Posted by No.3

Those ones that didn't go off look almost cupped from the firing pin strike to me - I would suggest that the issue may be related to what is for some reason known as primer sensitising during the primer seating operation or in other words they haven't been squeezed in hard enough to get the cup fully seated onto the anvil.

It's a fairly critical part of the operation, and doesn't take much of an error here to upset things enough that they don't play. What do you use to seat them?

Just used the priming tool in the cheap Lee press (it’s not a hand primer).