I have a drilling in that caliber. For my rifle making brass from 9.3x72R.works better, .Bertram brass is brittle and thin, using my C&H the Bertram brass won't hold a bullet I need to run it onto a 25p Sav die and then use my expander die.to bring it back up. The 9.3 has a think enough neck area to size and hold bullets.
My groove diameter is .260 and I size Speer 95gr .264s down. It will shoot .257s quite accurately but I worry about blow-by in a none replaceable barrel. It is quite accurate and I use it for coyote hunting in the thick stuff.
