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...The gas check could be thought of as a wrench..giving additional purchase on the rifling than just the soft surface skin of a lead bullet...
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I disagree. In regard to the old Ideal/Lyman type gas checks, they did not crimp onto the bullets like the more modern Hornady/RCBS gas checks. The Ideal/Lymans were not securely attached to the bullets enough to "act as a wench". If the check was turned by the rifling it was too loose to put any rotational forces on the bullet as a result. The checks were so loose (prior to crimp-ons), it was common for them to fall off during normal handling.