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Thread: Big trouble with little gas checks

  1. #21
    Boolit Buddy
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    Jun 2012
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    Douglas Ridge Rifle Club, Eagle Creek, Oregon
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    Here is a pic of the problem, by the way the maker has offered to replace or fix the mold. Notice the burr around the base of the bullets. Click image for larger version. 

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  2. #22
    Boolit Master
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    Quote Originally Posted by Ramson222 View Post
    Here is a pic of the problem, by the way the maker has offered to replace or fix the mold. Notice the burr around the base of the bullets. Click image for larger version. 

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    So you say if you remove the burr, the shank is too big? Do you mind measuring the shank?

    As for the flashing, I usually get that if my sprue plate is too hot, or I'm pressure pouring.

  3. #23
    Boolit Buddy
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    I measured six random bullets the shank is .286 to .288 at the largest obviously .284 diameter gas checks are not going to fit.

  4. #24
    Boolit Buddy dimaprok's Avatar
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    I'll tell you right now I ordered a sample of 30 caliber .017" gas checks and I had real hard time putting them on. Obviously you also have burrs that are in the way but for my own gas checks I've been using .012 that works great and later I discovered .014" works equally well. Having my own gas check punch I have luxury to have forming pin in any size. I use .286 for powder coated bullets and .284 - .285 for bare. For me 30 caliber gas checks are most consistent and easiest to work with. I have Lee, RCBS, NOE molds and they all work fine.

    Sent from my SM-G950U1 using Tapatalk

  5. #25
    Boolit Buddy dimaprok's Avatar
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    Quote Originally Posted by Ramson222 View Post
    I measured six random bullets the shank is .286 to .288 at the largest obviously .284 diameter gas checks are not going to fit.
    Ok Lee molds and some others have tapered shanks. If you measure most bottom at the base you'll get .284 - .283 and at the top you might get .288 or higher and that's ok, a standard GC should fit. I prefer NOE, it's not tapered and makes it easier to seat. A very small taper would be ok like from .284 to .285 but Lee has too much. I even experimented with making tapered forming pin, it's time consuming but it works.

    Sent from my SM-G950U1 using Tapatalk

  6. #26
    Boolit Buddy
    DHDeal's Avatar
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    You dimaprok are in an ideal situation having a gas check maker. It does add another complexity to the whole cast bullet thing, but with a check maker you don't worry about shank size much.

    I read about thinner gas checks (thinner than .015" anyway), but it seems vulcan checks is out of business. Sage's has .015" copper and aluminum and .017" copper.

    I hope the OP finds a way to make it work for him (with this mold I mean).

    I just paid attention to the flashing on the base and NOE makes a tool to remove the flashing, but it won't help the .286" - .288" shank, but that is a known.

    Ahh, the simplicity of a plain base bullet!

  7. #27
    Boolit Buddy
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    Jun 2012
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    Douglas Ridge Rifle Club, Eagle Creek, Oregon
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    My measurement were taken at the base of the bullet. I will be sending the mold back tomorrow.

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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