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A gas check is a copper cup or disc attached to the bottom of a lead bullet so the flame from the powder ignition doesn't cut the lead to make a good seal. It also prevents leading of the barrel.
Also, If you like copper jacketed bullets, you cannot beat Hornady XTP's for 454 Casull.
Mike
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Yes, in fact I do have a 454... in more ways than one. 
"No provision in our Constitution ought to be dearer to man than that which protects the rights of conscience against the enterprises of the civil authority" - Thomas Jefferson
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