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Thread: Issues Seating Cast Bullets

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  1. #1
    Member zimmer's Avatar
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    Oct 2012
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    Need to use a die such as Lymans M die to create a .308 clearance step in the case mouth. I think Lee may do something that will do a similar job.

    New brass can be hard to load with the first loading. I run an expander die thru them.

    Biggest issue though is probably your seating stem. How well does it fit the tip of the very flat nosed projectile? Not very well I would say.

    If you expand your case mouths with something like a M die (I usually go 20 thou deep) you can usually push the projectile in and align it reasonably well before seating. Your seating stems will not align the projectiles say like a spitzer is aligned with a standard seating stem.

    Gas checks should be easier to start than straight lead based projectiles.
    mimms2 likes this.

  2. #2
    Member Beetroot's Avatar
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    Quote Originally Posted by zimmer View Post
    Need to use a die such as Lymans M die to create a .308 clearance step in the case mouth. I think Lee may do something that will do a similar job.

    New brass can be hard to load with the first loading. I run an expander die thru them.

    Biggest issue though is probably your seating stem. How well does it fit the tip of the very flat nosed projectile? Not very well I would say.

    If you expand your case mouths with something like a M die (I usually go 20 thou deep) you can usually push the projectile in and align it reasonably well before seating. Your seating stems will not align the projectiles say like a spitzer is aligned with a standard seating stem.

    Gas checks should be easier to start than straight lead based projectiles.
    It does seem like the bullets are a tight fit and lack of boat tail makes starting the bullet difficult.
    The gas check is a tighter fit in a fired case than what a normal copper jacket bullet is.

    How does flaring work?
    Do you need a different seatign die or does the flared part of the case stay flared/the rest of the neck stretches out to the same diameter as the flared section upon seating the projectile?

    Measuring the gas check diameter shows it's .311" rather than .308" like my other projectiles, I guess that wont be helping either.

 

 

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