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Thread: Grit needed for mold lapping

  1. 04-11-2006, 02:00 AM #1
    Frank46
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    Grit needed for mold lapping

    I have a rcbs 300gr 45 rifle boolit mold that casts .458 and want to lap the molt to increase the diameter to .460. I have silicon carbide lapping compound starting at 220 grit all the way up to 1000 grit. Any suggestions are appreciated. Frank
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  2. 04-11-2006, 12:08 PM #2
    fourarmed
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    .002" is a long way to lap, in my limited experience. I would suggest Beagling (shimming) the mould with strips of aluminum tape. You will need to tape both faces of the mould to get .002" I would guess.
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  3. 04-11-2006, 02:30 PM #3
    redneckdan
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    I beagled a mold and got .004 before I started flashing, I was using ladel pour.
    Some where between here and there.....
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  4. 04-11-2006, 02:38 PM #4
    carpetman
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    redneckdan---You beagled a mold and got .004 before you started flashing. How big a crowd did you flash? You get on tv?
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  5. 04-11-2006, 09:54 PM #5
    montana_charlie
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    Quote Originally Posted by carpetman
    How big a crowd did you flash?
    If it doubled, it would have been .008.
    Is that considered a big crowd?
    CM
    Last edited by montana_charlie; 04-11-2006 at 09:57 PM.
    Retired...TWICE. Now just raisin' cows and livin' on borrowed time.
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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