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  1. #1
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    Jun 2012
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    300 WM case length

    I got carried away while trimming my brass is there a minimum case length for 300 WM. The book says trim to 2.610 I trimmed a lot to 2.575

  2. #2
    TGT Supporter Texasjack's Avatar
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    Re: 300 WM case length

    I think the guidance is a range of 0.020, so for the 300 WM it would run from 2.600 to 2.620(max length). That's why the trim-to length is 2.610, to allow for being off just a bit. Your cartridges are a bit shorter than that.

    The problem comes in from seating the bullet and crimping the case. Either the bullet is not as deep in the neck as it should be (to match up to the cannelure) or it will be seated deeper than it normally would (if you match the cannelure and not the OAL). Usually there's not much extra room in a magnum cartridge, as the powder usually fills it.

    Would it work? Yeah. Will it affect accuracy? Unfortunately, yeah. Hopefully you didn't trim a LOT of cases.

  3. #3
    New Member
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    I trimmed like 15 but they will extend out after I shoot them right?

  4. #4
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    They will extend some but not a lot.
    Kurt Gruber
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    Tactical Gun Review
    www.tacticalgunreview.com

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  5. #5
    Internet Tough Guy Texas1911's Avatar
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    Re: 300 WM case length

    How much they extend depends on the brass itself and how thick the necks are. Cut the load down significantly and fire a few to fire form the cases.
    http://www.subaruwrxsti.org - Subaru WRX STI Information and Tuning Resource
    http://www.vikingspeedshop.com - Tuning Parts for Subarus and others.


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