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Thread: Which size gas check for .315 'boolitt?"

  1. #1

    Which size gas check for .315 'boolitt?"

    I have a .315 gas check mold on order. I plan to size to .313. Can I get away with using my supply of .308 Hornaday gas checks. Lyman makes .312 gas checks but these are currently out of stock at Midway. Can I use Hornaday .323 gas checks? TIA

  2. #2
    Boolit Master

    stubshaft's Avatar
    Join Date
    Apr 2009
    Southernmost State of the Union
    NOE make a gas check expander tool. You can try that to open up those 30 cal checks.
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  3. #3
    I'm interpreting that answer as No, one cannot use .308 gaschecks on .315 bullets.

  4. #4
    Boolit Master
    Join Date
    Apr 2017
    What mold? A 30 caliber gas check is for a .284" shank. Most, if not all .314"-.315" bullets I see have the .284" shank.

  5. #5
    Boolit Master

    Bookworm's Avatar
    Join Date
    Jan 2016
    Central Oklahoma, on a dirt road.
    I use a NOE 316-213-RN (his version of the 311299, upsized). It drops are roughly.3165 - .317.

    I size to 316. I have had no problems using standard 30 caliber gas checks from Hornady, or from Sage's.

    Having said that, Sage makes a check specifically for 314 and up. I purchased some, but haven't yet used them.
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  6. #6

    ShooterAZ's Avatar
    Join Date
    Jan 2012
    Flagstaff, AZ
    The ordinary 30 caliber checks should work just fine. Check the mold drawings, but most "Fat 30" molds will have the .284 shank as mentioned above.

  7. #7
    Aha! Match the gas check to the shank, not the bullet diameter! I feel foolish for not realizing the obvious, but I imagine I would feel even more foolish trying to mate .323 gas checks to what the mold maker's diagram indicates is a .283 shank. Thanks to all who responded.

  8. #8
    Boolit Master Maven's Avatar
    Join Date
    Mar 2005
    Aha! Match the gas check to the shank, not the bullet diameter

    Exactly right! Late to this thread, but I use the same .30cal. GC's on a .3165" CB as I do on "as cast" ones from .309" -> .314": No problems in seating them or with accuracy.

  9. #9
    Boolit Master

    gwpercle's Avatar
    Join Date
    Sep 2011
    Baton Rouge, Louisiana
    My 303 British mould , Lee C312-185-1R , which drops a .312 boolit uses a .30 cal gas check , same as the 30-30 and 30-06 mould , Lee C309-170-F ...the 30 cal checks on the .312 boolit works just fine.
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  10. #10
    Boolit Buddy
    Join Date
    Feb 2011
    SE Kentucky
    FWIW I just miked a couple of Sage's 30 cal checks, o.d. is .320.

  11. #11
    Boolit Buddy
    Join Date
    Aug 2010
    Jacksonville, Al
    The average Hornady, Gator or Sage's copper gas checks made from .017 thick material will work up to .316 usually. We think the .015 gas checks are good up to .312. It depends on the actual shank size, bullet hardness and the target O.D. We recommend at least .002 under the O.D. for a max size. So, you take the shank: .284 + .017 + .017 = .318 and take off .002 = .316 max recommend.

  12. #12
    Former boolit designer

    Blammer's Avatar
    Join Date
    Feb 2007
    Asheville, NC
    30 cal GC's should work fine, try one or two is NOT my paypal addy

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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