If you're going to knock it out, measure the outside diameter of the barrel and drill a piece of wood to slip it in. The block is then mounted in the vise and no direct clamping pressure is on the barrel. Squirt a little oil down the barrel, insert dowel/brass rod from chamber end and whack away.
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Vigilantibus et non dormientibus jura subveniunt. Molon Labe!
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