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? re case trimming

Discussion in 'Handloading and Reloading' started by Lee Roder, Dec 11, 2009.

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  1. Lee Roder

    Lee Roder Member

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    My War Baby's expected early next year :evil: from the CMP so to get ready :D I've been reading everything about 30 carbine I can find BUT :confused: I've found this at thecmp.org in the help stickies (yes I read those) as justification for trimming new cases:

    "New cases are sometimes out of round, dented, too long, or have case mouths long on one side and shorter on the other side. The best practices recommendation is to full length resize them, case mouth expand them, and then trim them to length as you would any other fired case."

    thus challenging my understanding of The Process. I've always flared AFTER "trimming".

    I don't understand.
     
  2. EddieNFL

    EddieNFL member

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    News to me.
     
  3. rfwobbly

    rfwobbly Member

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    External "sizing" doesn't always get a case round. Rarely, but sometimes, a case needs pushing out with the internal expander to become truly round again to achieve the best trim results.

    The "expander" is the lower part of the "belling" tool. The key to their statement here is that they said "expand" and not "bell". So they are suggesting running the expander in far enough to make the case mouth round, without going deep enough to flair the case mouth.

    The step may sound excessive, but I think they are simply covering all the bases.

    Hope this helps!
     
  4. 243winxb

    243winxb Member

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    You need to make the mouth round so the pilot will fit, dont flare/bell the mouth. [​IMG][/URL][/IMG] Photo shows a 38, Not a 30 carbine.
     
    Last edited: Dec 12, 2009
  5. Randy1911

    Randy1911 Member

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    They are saying to expand without flaring so the case trimmer pilot will fit into the case mouth.
     
  6. Walkalong

    Walkalong Moderator

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    Deleted on account of not paying attention. Arghh.

    See post #12
     
    Last edited: Dec 12, 2009
  7. Lee Roder

    Lee Roder Member

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    OK so "expand" and "bell/flare" are not the same. Got it (I think). Thanks guys.
     
  8. Walkalong

    Walkalong Moderator

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    Deleted on account of not paying attention. Arghh.

    See post #12
     
    Last edited: Dec 12, 2009
  9. EddieNFL

    EddieNFL member

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    Makes sense. Trimming rifle cartridges brings bottleneck to my mind. Gotta think outside the box.
     
  10. Walkalong

    Walkalong Moderator

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    If your pilot fits properly, it will hold it round while it is being trimmed, besides, unless you are loading match ammo for a world class gun, it will never make a difference as long as the case mouth is close enough to round to go over a properly fitting pilot.
     
  11. jr_roosa

    jr_roosa Member

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    I've never belled rifle brass anyway. I deburr the case mouth on all brass (new, old, trimmed, and not) and I have no problems with the bullet going in smoothly.

    With new brass for my Garand I full length size (most winchester brass is shorter than my chamber anyway so it's practically neck sizing), check length, trim long brass (I've never had a long winchester case), deburr all the case mouths, and load as per usual. I don't care if the mouth is a little off square since they all need trimming after the first firing anyway, and I don't think that it affects accuracy enough to matter.

    -J.
     
  12. Walkalong

    Walkalong Moderator

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    For some reason I had pistol calibers on my mind during this thread, so one will have to disregard some of what I have posted.

    -------------------------------------------------------------------------------------------

    Bottle necked rifle caliber pilots for trimmers are designed to fit cases which have been sized and expanded. Not so with straight walled rifle calibers. I'll learn to pay attention better someday,.... maybe. :banghead:

    Straight walled pistol caliber pilots are designed to fit cases which have been sized, but not expanded. This would include the .30 Carbine rifle cartridge.


    There. I think I got it right this time. :p
     
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