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Canalure vs throat

Discussion in 'Handloading and Reloading' started by 86thecat, Nov 27, 2007.

  1. 86thecat

    86thecat Member

    May 31, 2007
    Central WA
    Reloading for a Mod 70 375 H&H which has taken a dislike to most spitzers. Having much better accuracy with round nose. Checking length to lands for Hornady 300gn btsp's I would have to seat about .250" longer than max OAL (canalure 1/4" beyond case). Checked various bullets and have found distance from canalure to point which bullet is land diameter varies from .030 to .200". Am I missing something here? Do bullets normally vary this much in distance to canalure to ogive? The rifle has 500+ rounds through it so the throat may be opening up a little but I don't expect good accuracy with a .200" jump.
  2. jmorris

    jmorris Mentor

    Sep 30, 2005
    I routinely load bullets out further than the cannelure (with no crimp) for the same reason you mention. I do so in a single shot bolt action with great results. If you were to do that in your 375 H&H with a full magazine, I would worry about the bullets moving around during recoil. You could load them one at a time to see if they make any noticeable difference, if so invest in one of these http://www.buffaloarms.com/browse.cfm/2,350.htm and put the cannelure exactly where you want it.
  3. rcmodel

    rcmodel Member in memoriam

    Sep 17, 2007
    Eastern KS
    Yes they do.
    The factory puts the cannelure on bullets to make the loaded round a standard OAL length to fit box magazines, and prevent bullet set-back from recoil. There is no consideration given to what effect bullet design or ogive shape has in relation to the leade or rifling when figuring cannelure placement.


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