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Thread: Trapdoor barrel thread pitch & dimensions

  1. #1
    Boolit Buddy
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    Trapdoor barrel thread pitch & dimensions

    Anyone know the thread pitch and dimensions for the M1884 Springfield Trapdoor barrel
    Or better yet, any drawings out there?

    Thanks

  2. #2
    Boolit Master




    bruce drake's Avatar
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    Thread is 10 square threads per inch, Barrel shank length 1.433 inches with 0.875 inches threaded, Major thread diameter 0.900 inches, minor diameter 0.850 inches - barrel diameter nominal 1.0 inches
    I Cast my Boolits, Therefore I am Happy.
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  3. #3
    Boolit Buddy
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    Thank you Bruce!

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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