Shoulder Length Question

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by TX mountain hunter, Jan 16, 2013.

  1. TX mountain hunter

    TX mountain hunter Well-Known Member

    Dec 17, 2010
    After getting no response and over 50 views in another location, I thought I'd try again here...

    Would there be any reason a .420 size hornady headspace gauge attachment would not work on a 30-378? .420 appears to be as high as they go from what I can tell. This cartridge doesn't appear to be listed in the charts..