Just the comparison. Here is a picture of primers.
From the left, 10ga RST factory, Rem. Gun Club Factory, Rem. Gun Club with AA209 reload 5800psi.
I personally don't see much difference to the shells in question. Doesn't the upset around the firing pin have more to do with the length and shape of the firing pin? I believe the extrusion you see around the brass cup is a reflection in both photos. Craig

Last edited by Craig Larter; 02/05/14 08:11 AM.