Head size difference

Discussion in 'Handloading and Reloading' started by andym79, Apr 29, 2019.

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  1. andym79

    andym79 Member

    Joined:
    Aug 20, 2005
    Messages:
    530
    Location:
    Australia
    Hi guys I am wanting to do a 35-90.

    The idea going through my head at the moment is to use 45-90 brass and a 350 rem mag reamer run in .375" short. Using dies cut short too.

    My only concern is case head diameter, being .513 for a 350 and .506 for a 45-90!

    Is a .007" difference too much or okay?

    I am hoping to end up with a rimmed 35-90 using cast bullets and either bp or trailboss so pressure will be low, but will I likely get a bulge at the head or worse a split?
     
  2. Swampman

    Swampman Old Fart

    Joined:
    Oct 15, 2011
    Messages:
    2,113
    Location:
    East Texas
    I can't give you an actual answer, but American made 6.5x55 Swede cases have been made with .472" head size and the CIP standard is 12.2 mm (slightly over .480").

    I've seen cases that showed noticable expansion above the case head, but I can't recall hearing about any catastrophic failures that could be definitively blamed on undersized brass alone.
     
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