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Thread: Gator Gas Check Problem

  1. #1
    Boolit Mold EMT480's Avatar
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    Gator Gas Check Problem

    I have some gator gas checks that are supposed to be for the .348 Win. I have an accurate bulled mold for casting .348 gas check boolits. The gas checks fit the shank properly. The problem I am having is seating and sizing. I made my own lubrisizer die sizing to .348. The force required to seat the check compresses the boolit and shaves the sides. Band diameter of my boolit as cast is .349-.350. Diameter of the gas check is .356. Is this the proper size for the gas check or is it to big? Any ideas or suggestions would be greatly appreciated. I may possibly make another sizing die or two in larger sizes.

  2. #2
    Boolit Master ammohead's Avatar
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    You could anneal them by floating on your molten alloy, maybe in a spoon to keep them clean. Perhaps your alloy could be softer. There is no need for a super hard bullet in that old girl. I have Hornady that measure .354 and some vintage lymans that measure a svelt .350

  3. #3
    Boolit Master


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    I only size my bullets with push through dies. I don't expect you would have any issues that way. I lube my bullets in an H and I size die .001" larger than bullet size. Trying to size bullets in the lubesizer I never could get bullets to enter the die straight, thus resulting in damaged bullets.
    Rick

  4. #4
    Boolit Master
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    Quote Originally Posted by EMT480 View Post
    I have some gator gas checks that are supposed to be for the .348 Win. I have an accurate bulled mold for casting .348 gas check boolits. The gas checks fit the shank properly. The problem I am having is seating and sizing. I made my own lubrisizer die sizing to .348. The force required to seat the check compresses the boolit and shaves the sides. Band diameter of my boolit as cast is .349-.350. Diameter of the gas check is .356. Is this the proper size for the gas check or is it to big? Any ideas or suggestions would be greatly appreciated. I may possibly make another sizing die or two in larger sizes.
    Did you bevel the entry opening of your sizer die? This is crucial to prevent shaving.

  5. #5
    Boolit Mold EMT480's Avatar
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    What I ended up doing is tapering the entry of the die and polishing it a little more than I had done previously. Works like a champ now. Thank you for the comments.

    Sent from my SM-N970U using Tapatalk

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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