Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by canjaeger, Apr 6, 2004.

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  1. canjaeger

    canjaeger Active Member

    Feb 15, 2004
    crimping match bullets is it a no no [​IMG] i crimp my fmj's knoch around ammo for my bolt gun with a lee fc
    what about match what do you all think and why thanks
    jaeger [​IMG]
  2. Dave King

    Dave King Well-Known Member

    May 3, 2001
    Are there any match bullets that have a canneleur? I don't see how it'll enhance accuracy, probably change the "pull" tension on the case mouth and deform the bullet more than need be.

    Best way to find out for sure is load some up, crimp some and leave others alone and run a test (long(er) range).
  3. Ian M

    Ian M Well-Known Member

    May 3, 2001
    I was told that the Federel Gold Medal .308 Win. round has a very slight amount of crimp - not sure it is visible but apparently it is done. [​IMG]
    Crimping is not just for .30-30's and 94 Winchesters, or mil spec ammo I guess.
  4. marc357

    marc357 Active Member

    Nov 17, 2003
    I shoot a .300 WinMag. I also feed from the magazine, so I want the bullets to stay in place. I have gotten great results with the Redding Taper Crimp Die. Gives it a nice taper crimp, without mashing(technical term) the case mouth. No cannelure needed.

    I don't crimp 'em too much, I adjust the die till it touches the case, plus about 3/4 turn.

    The Lee Factory Crimp Die will give you as hard a crimp as you like, but it mashes the case mouth, making it thinner, and requiring trimming cases to length more often.

    Many say a crimp is not conducive to best accuracy, I believe CONSISTENCY is the key. My results show very consistent velocities, and STELLAR accuracy.

    By crimping, you ARE introducing another variable, so you have to pay attention. Any that don't "feel" right when crimping, I segregate, and use for foulers and coarse work, like whacking steel maidens, shooting offhand, etc.

    To get a consistent crimp, your cases need to be trimmed to the same length. Hope this helps.