Gas check to big?

[BUFFALOW RED]

I got a new Lee double mold throw's 184 gr .313 for 303British.
First session cast around 500 nice boolits , got out the Hornady 30 cal gas checks and they seam to big to grab shank.
Do I have wrong checks?
Are there different size .30 cal check s?
I searched for ansers but post I found were a bout checks to small

[Bad Ass Wallace]

I size my 303 boolits in a 0.316" die and use 8mm gas checks. They really crimp on.

[BUFFALOW RED]

So 8 mm checks would be bigger than 30 cal Hornady I think.
The base of my boolits is to small for 30 cal

[mehavey]

Have you actually installed the GC and sized the bullet... and the GC is still loose/comes off?

[BUFFALOW RED]

Not sized,
as Cast is .3125 so I don't want it smaller in diameter

[Dusty Bannister]

Do the bullet shanks have sharp well filled out bases or are they slightly rounded? If your bullets are shiny and not completely filled out, that could result in an undersized shank. If you are sizing the bullet to .313" and use a check intended for a .310" application, it might not be crimping the check enough to grip the shank.

[BUFFALOW RED]

If you are sizing the bullet to .313" and use a check intended for a .310" application, it might not be crimping the check enough to grip the shank.

I think this might be the problem. Check seems to small on outside while to big on inside at same time.
Maybe there are checks for 312-313 . I need to check on this possible solution
THANKS for your input

[megasupermagnum]

Not sized,
as Cast is .3125 so I don't want it smaller in diameter

You have to size them, that is the only way I know to make gas checks fit. They are supposed to fit on easy, then crimp onto the shank. Sages sells both .015" thick and .017" thick 30 caliber gas checks. I've used both to good effect on .314" sized bullets.

Try a .313" sizer.

[Larry Gibson]

You have the right GCs. I've 2 of those moulds [older original design single cavity and newer design double cavity] and have never had a C fit problem. I agree with post #5, the bases are probably not filled out leaving the GC shank too small. Years ago when I started casting I found the same problem. I found it was not the GCs or the moulds fault but my own in not casting correctly.

What alloy?

Dipper or bottom pour?

Alloy temp?

[mehavey]

Not sized,
as Cast is .3125 so I don't want it smaller in diameter

No GC is going to stay on until sized on.
As MegaSuper suggests, run it through a 0.313 sizer and you'll get the GC to crimp/stay on.

[BUFFALOW RED]

You have the right GCs. I've 2 of those moulds [older original design single cavity and newer design double cavity] and have never had a C fit problem. I agree with post #5, the bases are probably not filled out leaving the GC shank too small. Years ago when I started casting I found the same problem. I found it was not the GCs or the moulds fault but my own in not casting correctly.

What alloy?

Dipper or bottom pour?

Alloy temp?

WW + 6" solder added per 20 lb pot bottom pour. droped in water as coming out of mold . turkey thermometer go's to 550 i have good results on pistol casting when needle is 1/2 way past 550 going towards 0. pretty much strait down

[BUFFALOW RED]

well im going out to measure have to reply back later with more info
THANKS

[mehavey]

The colder you (successfully) cast, the larger the eventual diameter all round.
Be that as it may, however, you're going to have to size ( .313") those gas check on to stay.

[Bookworm]

I had a problem with copper checks not staying on after being crimped.

Annealing the checks prior to installing solved the problem.

I just put the checks on a piece of ceramic tile, and heated them with a propane torch. Got them glowing, back to dead soft.

Problem went away.

[Larry Gibson]

WW + 6" solder added per 20 lb pot bottom pour. droped in water as coming out of mold . turkey thermometer go's to 550 i have good results on pistol casting when needle is 1/2 way past 550 going towards 0. pretty much strait down

Try turning up the temp a bit more. Allow the alloy to boil back out of the sprue hole and let a good sprue for....even I alloy rolls off the mould.

[Screwbolts]

What Larry says above /\ crank up the heat and let the alloy boil out.

[BUFFALOW RED]

the Boolits seem to be filled out well i feel. they measure .313. my bore is .3135- .314 , im concerned that starting out 1/2-1 thousandth smaller than barrel might be a problem.

the boolit shank measures .283 from the new double mold
the gas check inside measures .2855
the boolit shank measures .288 on the old single mold

[BUFFALOW RED]

from new double mold
shank measures .283

[BUFFALOW RED]

so i'm looking at the Lee sizer do i want the .313 or the .314 sizing die?
as my barrel is .3135-.314
seems like the boolit should be .314 or biger before sizing or im i thinking wrong here?
THANKS FOR ALL Y'ALLS HELP

[BUFFALOW RED]

FROM OLD SINGLE MOLD
note the height of shank compared to double mold
shank measures .288