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Thread: Lapping a mould

  1. #1
    Boolit Master
    Join Date
    Sep 2008
    Location
    white mts AZ
    Posts
    259

    Lapping a mould

    I have a saeco #356 mould that drops a little undersized, the bore riding area especially. I was thinking lapping it would be the best fix. What do the experts think?

  2. #2
    Boolit Master

    runfiverun's Avatar
    Join Date
    Dec 2007
    Location
    soda springs Id.
    Posts
    16,803
    i'd try beagling first and see how it responds to the sizer and bbl.
    then maybe a slow lapping.
    it's all an educated guess,,,, till the trigger is pulled.

    the more i find out about shootin boolits, the more it contradicts everything i ever learned about shooting jaxketed.

  3. #3
    Boolit Master in Heaven's Range
    Join Date
    Feb 2009
    Location
    HELL
    Posts
    140
    What size are they coming out now, and how much more size do you need?

  4. #4
    Boolit Master

    Join Date
    May 2005
    Location
    Castlegar, B.C., Canada
    Posts
    2,984
    I have lapped moulds out up to 0.004" successfully. It is work though and there is risk of ruining a mould.

    How much do you need? If only a thou or two then it is quite easy but as runfiverun pointed out Beagling is easier... and no risk of mould damage.

    I would give the Beagling a try then if it works you can decide it you want to lap. If it doesn't then lapping may not do it either. Beagling can give you up to about 0.003" larger.

    FWIW

    Longbow

  5. #5
    Boolit Master

    MtGun44's Avatar
    Join Date
    Nov 2006
    Location
    eastern Kansas- suburb of KC
    Posts
    11,931
    beagle first, may never need to lap. Far easier and reversible.

    Bill
    If it was easy, anybody could do it.

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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