My dirty-30 is a Marlin so don`t pay me no nevermind
,but I have a friend & he grabs a few of my Lee 150 309 rnfps as cast, they .310 + a 1/2 a hair & he tumble loobes em no gas check & has a ball with em with 7grs. of reddot under em & they shoot where ya lookin to boot !!
Anyways my advise is to shoot as big a bullet as ya can reliably chamber .