Which size gas check for .315 'boolitt?"

[El Bibliotecario]

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

[stubshaft]

NOE make a gas check expander tool. You can try that to open up those 30 cal checks.

[El Bibliotecario]

I'm interpreting that answer as No, one cannot use .308 gaschecks on .315 bullets.

[megasupermagnum]

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.

[Bookworm]

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.

[ShooterAZ]

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.

[El Bibliotecario]

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.

[Maven]

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.

[gwpercle]

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.
Gary

[Rich/WIS]

FWIW I just miked a couple of Sage's 30 cal checks, o.d. is .320.

[Blammer]

30 cal GC's should work fine, try one or two