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Thread: Case setback with Mouse farts in .308?

  1. #21
    Boolit Master 243winxb's Avatar
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    Aug 2005
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    USA
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    Yes.

    An M16 can set the shoulder back .001" by allowing the bolt to slam home on a slightly over size round.
    But may stick in chamber & be hard to eject.

    The extractor has a better hold on the rim in the M16, so there is little to no shoulder movement from the firing pin strike. Rem M700, same.
    Last edited by 243winxb; 01-07-2023 at 01:06 AM.

  2. #22
    Boolit Master
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    Jan 2009
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    Quote Originally Posted by charlie b View Post
    So just the force of the firing pin on the case was enough to set back the shoulder?
    Bolt action military rifles often have very heavy firing pin striker impacts. Setback might even be more.

  3. #23
    Boolit Master trapper9260's Avatar
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    Feb 2010
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    Iowa
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    Thanks Larry for going into detail on your test and explaining all. I am always learning from you and others on here . I am trying to find a easy way to dye the cases that would be used for this with the over size flash hole so it is easy to know what ones they are , anyone have any .
    Life Member of NRA,NTA,DAV ,ITA. Also member of FTA,CBA

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check