30 cal check question

[trying2learn]

I am wondering how it is that all the 30 cal checks out are for .311 but I have noticed that some of these boolits I have wothout checks are .290 or real close to that at the gas check shank. Is that normal? I have assumed and was looking for confirmation that the check crimps down to the diameter it needs. Therefore the two different sizes to allow the check to be installed by hand then ran through the machine to perform the crimp. Am I crazy or is something wrong with the mold where the shank size is to small? I verified it and it is a lyman 30 cal mold that I am borrowing from a co worker.

Sent from my SPH-L710 using Tapatalk 2

[Ben]

Look at this chart. If your gas check shank dia. corresponds with the chart, you should be good to go.

http://www.castpics.net/subsite2/Classics/Gascheck%20Shank%20Sizes%20and%20Diameters.pdf

[trying2learn]

Ben I appreciate it. I am still just a tad confused. The ones my co worker offered me to try out just say 30 cal check (.311) according to him. He is bringing them to me tomorrow. So i will try a few and see.

Sent from my SPH-L710 using Tapatalk 2

[Ben]

trying2learn :

A gas check shank on a typical .30 cal. bullet is .284"
The thickness of the metal that I use to make my own
g/c's is .014 " Ameri-Max aluminum.

2 X .014 " = .028" + the original dia. of
the gas check shank of .284 " = 312"

After the bullet is pushed through my
.310" sizer die I've got a nice tight fit
and the gas check offers an excellent gas seal.

Does that help ?

Ben

[trying2learn]

Acrually yes. Thank you ben for r hat. I believe iblbundersrand it now. Thajks again for taking the time to help me. I aappreciate it all.

Sent from my SPH-L710 using Tapatalk 2

[patsher]

Yes, I appreciate that explanation also, Ben. Thanks!
Pat

[Goatwhiskers]

Well I'm still a bit confused. My shanks are .282". I would "like" to use the aluminum sheet I have which is .008" and I have plenty of it. Checks won't stay on after sizing thru a Lee die which is .3094". Tried doubling the material, but no joy. What now? GW

[JonB_in_Glencoe]

Well I'm still a bit confused. My shanks are .282". I would "like" to use the aluminum sheet I have which is .008" and I have plenty of it. Checks won't stay on after sizing thru a Lee die which is .3094". Tried doubling the material, but no joy. What now? GW

Goat,
sometimes if you pre-size the boolit without a check installed, the shank will get bumped up. then seat the check and run through the sizer again. Yeah, I know this is a pain, but sometimes it does the trick.
Jon

[fcvan]

Goatwhiskers, .008 sounds like gat material for plain based checks. I've been using Amerimax .014 for my 30 cal checks. They punch nicely with my CheckMaker and form into pretty little checks that stay put on my boolits. I've been using soda cans for my plain based checks and they work very well. For grins and giggles I did punch out some plain based checks with the .014 material and seated them on boolits. It took a bit more effort as can be expected. I'm looking forward to getting some .008 material to make some plain based checks. Frank

[Goatwhiskers]

At least I learn from my mistakes. Went back and tried again on doubling the .008" material, it seats just fine--don't know what I did wrong the first time. Looks to me as tho I need to try .014, .015, or .016" material. The search is on! By the way, will doubled material work?GW

[trying2learn]

Look at me starting a question and actually learnin some people new things. I am even learning something. Lol.

Sent from my SPH-L710 using Tapatalk 2

[Dthunter]

I am super fortunate to live in an area where there is a massive amount of industry which uses aluminum sheet metal to cover all piping!

It makes the material very easy to get. I was given a dozen sheets of brand new .016" thick Aluminum (3 feet by 3 feet dimension) Reduces my costs significantly. I can also get the waste material thats clean as well. It works just great for my .308 gaschecks.

Hopefully this gives some of you guys some more ideas of where to get cheap material.
I live in Northern Canada, so this material may be more common in our location (colder climate)

[cast367]

I became aluminium sheets from a print shop. Its 0.12 thick and its works very well for my .30 bullits.
The hornady copper checks are very expensif here.

[Ben]

Well I'm still a bit confused. My shanks are .282". I would "like" to use the aluminum sheet I have which is .008" and I have plenty of it. Checks won't stay on after sizing thru a Lee die which is .3094". Tried doubling the material, but no joy. What now? GW

Goatwhiskers

You say you have a 282 gas check shank. If you're using .008 material, 2 X .008" = .016 , That added to the dia. of your gas check shank = .298

You say you're pushing the bullet into a .3094 die. If a .298" dia bullet base is going into a .3094 hole and the g/c is loose, are you still confused ?

My calculations show that you'd need a minimum of .016" thickness material for your gas check to get it to work with a .282 " dia. shank.



Ben

[bstone5]

The Cola Can material is .004 this material works for flat base bullets, the roof sheathing material up to .006 works also well on flat base bullets, for a gas check base the .014 sometimes works but the .016 material has always worked on gas check bases.

Just my 2 cents worth.

Aluminum Gas checks are very good in keeping lead out of the barrel at higher pressures, usually.