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Thread: I need help with the length for "roll crimping" the 12ga 3.5"

  1. #1
    GunLoad Trainee
    Join Date
    Oct 2010
    Posts
    5

    Default I need help with the length for "roll crimping" the 12ga 3.5"

    My first post & first shotshell loading:
    I'm wanting to load some 12ga. 3.5", #4 buckshot loads. But I can not find the hull length for
    "roll crimping" the 3.5".

    Lyman 5TH Shotshell Reloading gives the "roll crimp" lengths for 2.75" and 3" but not for the
    3.5".

    I'm in fear of someone telling me you can't roll crimp the 3.5"!!!

    Lyman 5TH Shotshell Reloading Pages 404 and 405:
    MAX HULL LENGTH FOR 2.75":
    ROLL CRIMP: 2.450
    FOLD CRIMP: 2.405

    MAX HULL LENGTH FOR 3":
    ROLL CRIMP: 2.760
    FOLD CRIMP: 2.655

    MAX HULL LENGTH FOR 3.5":
    FOLD CRIMP: 3.155

    Any place you know where I can get it or can someone give me length from a publication that
    you have?

    Many THANKS IN ADVANCE.

  2. #2
    runfiverun runfiverun's Avatar
    Join Date
    Dec 2007
    Location
    soda springs idaho
    Posts
    657

    Default

    your bbl will give you your maximum length.
    you don't want the crimp extending into the bbl past the chambering step.
    since you will probably be cutting the cases from fold crimped ones anyways.
    i'd go right where they were formerly folded over, plus enough for the roll.
    being a couple thou short on a shotgun hull will not deform patterns as the wad will carry over the small gap.
    you'll also still have the same amount of hull capacity which will keep your loads more inline with published data for folded crimps.

  3. #3
    GunLoad Trainee
    Join Date
    Oct 2010
    Posts
    5

    Default

    runfiverun Thank you!

    You just confirmed my thoughts on what the book did not tell me.

    Thanks again!

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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        

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