and gas checks are?....

Gas checks are shallow copper cups that are pressed onto the base of cast bullets during swaging. The mould should be shaped to allow a shallow groove around the base of the bullet (I think; I might be wrong on that).

Anyhow, the purpose is to allow a higher velocity without leading the bore. For instance, the Lyman 169-grain gas-checked .311 bullet can be driven to around 2,000 ft/sec from an '06.

Hope this helps,

Art

During sizing, the gas check crimps to the base of cast lead bullets to seal gases and protect the base from deformation.

Ed

i reload cast lead 200gr RNFT for my 45LCF......should i be doing gas checks?...how?

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No.
#1 You don't need them for most .45 olt loads
#2 You can't. They won't fit.

Gas checks can only be used on bullets that are specially designed for them.

And they should always be used on such bullets.

I think you were better off with the "hydrostatic shock" rant, BB...

I wish people would quit saying Series 70 when what they really mean is Pre-Series 80!

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What's this if it ain't a Series 70 Colt?

Most Hand gun bullets (cast ) don't require the use of a Gas check due to the lower verlosities used . If a Gas check is required the Manufacturer of the Mould will have a note stating GC in the description as the Base of the Bullet is ressesed (a small lip to accept the Gas check ) I do have a RCBS mould for a 240gn SWC that is designed for Gas checks .I've never used them on it as I only load up to about 1000fps.
You place the Gascheck onto the base of your Bullet before sizeing it & as it goes through the sizer it is crimped into place on the base of the Bullet & basicly protects the Base of the Bullet from heat & being deformed & stops leading to a degree ! This enables you to load heavier loads & take you vel up around the 2000 fps mark !

Dave

G98, You are missing the point and this thread isn't the place to discuss my signature.
Check you PM please.