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Correct. That is why .22LR at 1200fps have no GCs either .... and there was a recent thread here on NZHS about whether you need to clean .22LR barrels. Clearly no major fouling issue from lack of...

Tar paper wads they are.

Not quite the same application though. Mk VII bullets were exposed lead bottom at the centre, so the disc just took care of shielding that. But it did not need to...