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adjusting OAL

Discussion in 'Reloading' started by emtjr928, Jul 29, 2012.

  1. emtjr928


    Jan 26, 2012
    McDonough, Ga.
    Please tell me if this seems right: Two bullets same type (CMJ), same weight , same diameter, same caliber but different manufacturer. The tried and true measures .6355 long. I have a number of bullets from a different manufacturer that measure .596 long.
    If I wanted to duplicate the tried and true load with the shorter bullet, I should adjust my COL so that the round chamber volume would be the same?

    All the math sounds right.

    Thanks Ed
  2. firefighter4215


    Nov 2, 2009
    It seems sensible. I bought some pulled HSTs to load. They're longer than XTPs, which is the bullet used in most of my load data. I just added the extra length of the bullet to the OAL, and that seemed to work fine. Granted that's the opposite of what you're wanting to do, but along the same lines. I probably wouldn't shorten them all the way down at once. Shorten them a little at a time to watch for problems.

  3. fredj338


    Dec 22, 2004
    Well, sort of. As you have just learned, bullets are NOT plug & play. THe OAL MUST fit your gun, so try a dummy round loaded as you indicate, that should give the same internal volume, then check for fit in your barrel. If it won't chamber, then you have to seat it deeper & may or may not need to adjust powder charge depending on how close to max you are.
    Last edited: Jul 30, 2012
  4. Zombie Steve

    Zombie Steve Decap Pin Killa

    May 31, 2007
    Old Colorado City
    Use the longest OAL that functions well in your gun, and whenever you change components, it's always wise to back off the powder charge and work your way up again. It may be working at different pressures, and the gun may like something different anyway...

    It doesn't sound like it will be a big deal in this instance, but it's the safe thing to do...
  5. fredj338


    Dec 22, 2004