I have a 1979 Marlin 336 and have been casting Lee's .309/150 gr projectiles for it with good success. Am wanting a different mold but discover my chamber to be surprisingly tight. Even on the 150 get little land marks about 3/16 from mouth of the brass. Have tried a few options that often won't allow the bolt to close the last 16th of an inch. Had a friend send me a few of the Ranch Dog style bullets and the action will close but it also leaves land marks on the projectile. Curious what you other guys may be loading for a late 70s 336 or if you are just trimming your brass back a bit to accommodate. Thanks for the help.
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