I've recently encountered 310 CMR dies in calibers .264 Mag, 6.5 Rem mag and 7 mm Mag. I have never seen these calibers listed in a Lyman table showing the adapter ring and priming tool size but I suspect these three would all use the same one, whatever it is. I suspect it is the same as the .375 H&H which is a #13. Anyone have a #13 adapter ring or PC to satisfy my curiosity?