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Need help with a seating die

Discussion in 'Handloading and Reloading' started by mshiermd, Jan 3, 2008.

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  1. mshiermd

    mshiermd Member

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    I am getting tired of the variation in OAL with my cheap seating die. Need to move on and would like a little guidance in buying a seating die for .223. My
    1in9" will be shooting 50-69gr bullets and the 1in7" will be shooting 75and 80gr missles. Advice appreciated.
     
  2. Walkalong

    Walkalong Moderator

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  3. ReloaderFred

    ReloaderFred Member

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    Good advice from Walkalong, but I would like to add one more bit of information, if I may. Most rifle seating dies don't touch the tip of the bullet, which is the point you're measuring for over all length. Most seating dies are tapered and actually contact the bullet on the ogive, at some point, depending on the shape of both the seating stem and the bullet.

    With that said, there is some variance in bullets, even from the same lot. Measure your bullets for length and see if they're all the same from the base to the tip. If they aren't, then that's where the difference is in your OAL measurements, not actually in the dies themselves.

    The actual measurement you're concerned with, other than the rounds fitting in the magazines, is the distance of the bullet from the lands, or leade, of the chamber, at the point the bullet actually makes contact with the rifling. It's possible you're measuring something that might not matter at all in achieving the best accuracy.

    Hope this helps.

    Fred
     
  4. rcmodel

    rcmodel Member in memoriam

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    +1 to what ReloaderFred said.

    Another factor that can affect uniform seating depth is whether or not you clean case-necks. And whether you keep cases segrated by brand & the number of times they have been fired / reloaded.

    It will require different seating pressure from round to round if some of your case-necks are cruddy, and some are work-hardened from reloading more then others.

    1224.jpg
    rcmodel
     
  5. 30Cal

    30Cal Member

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    Just to be clear. It's the bullets, not the die. Even match bullets will vary quite a bit.
     
  6. stovepipe699

    stovepipe699 Member

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    I had the same problem and bought a competition seating die(thought my Lee was no good).The fancy die was no better. I learned the hard way what the gentlemen above told you. You can buy a kit from stoney point that goes on your caliper and allows you to measure bullet seating depth from the base of the cartridge to the bullet ogive, rather than the tip of the bullet(which varies greatly as mentioned by the others). I beleive it's called a comperator. I hope this is of help.
     
  7. Ol` Joe

    Ol` Joe Member

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    Great tool for what you want to measure. They have been bought out by Hornady though. The names been changed but the tool hasn`t, and is still available from MidwayUSA
    http://www.midwayusa.com/esearch.exe/search?search_keywords=comparator&category_selector=9315
     
  8. kennedy

    kennedy Member

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    had same problems with sierra matchkings, asked sierra about it and they admitted the lenght of the bullets vary, but the distance from the ogive to the base is exact. so I set my lee die with a bullet of average lenght and don`t worry about it. My accurracy is better now I am not constantly changing the die to give the same OAL.
     
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