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Thread: Help with Gas checks for MP .32 cal HP bullets

  1. #1
    Boolit Bub
    Join Date
    Sep 2005
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    Rocky Mountains
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    Help with Gas checks for MP .32 cal HP bullets

    I've got two MP molds that are both GC designs. One is the Mjolnir HP and the other is a 100 grain 640 series HP bullet. I want to gas check these after powder coating but I noticed that the gas checks barely fit the shanks as it is before coating. I currently have .30 cal .015 thick copper checks from Sage. What is everyone using on their .32 bullets cast from MP molds? My alloy is 96-2-2, blended from pure lead, COWW and some extra tin.

  2. #2
    Boolit Buddy

    Join Date
    May 2015
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    Anchorage, AK
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    I have the same problem and ordered a gas check expander from NOE to open them up abit more before installing them.

  3. #3
    Boolit Master

    jcren's Avatar
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    Nov 2014
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    South, Central Ok
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    I believe Sage offers over sized 30 cal checks for 303. I would check with him.
    "In God we trust, in all others, check the manual!"

  4. #4
    Boolit Bub
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    He recommended the .015 .30 cal checks I bought.

  5. #5
    Boolit Buddy
    Join Date
    Jan 2011
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    Prineville, Oregon
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    313
    I have the Mjolnir mould also and have checked them with both Sage's .015 30 cal checks and the 303 checks. I don't think the .303 check is any bigger in the butt -- fits with equal tightness. But it is taller when installed. I don't shoot well enough with my Ruger revolver to be able to tell you whether one is better than the other, but they both seem to work fine.

    I size/check on a Star so I don't have to worry about a tight fitting check but I do believe these would be a little on the tight side after powder coating and would be tougher to get checked if using the old Lyman.

  6. #6
    Boolit Master waco's Avatar
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    Jan 2009
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    Springfield, Oregon
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    Quote Originally Posted by Greg S View Post
    I have the same problem and ordered a gas check expander from NOE to open them up abit more before installing them.
    ^^^This^^^
    They work very well.
    The fear of the Lord is the beginning of knowledge: but fools despise wisdom and instruction.
    Proverbs 1:7

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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