Originally Posted By: KY Jon
In one metal is stretched and the other it is compressed.


Why is one compressed and the other stretched? Aren't they both stretched, one from the inside, out (bulge) and the other from the outside, in (dent)?

Wouldn't compression of the barrel wall be comparable to having a bore sized steel plug inside and hammering it from the outside, forging so to speak, like a blacksmith hammering a piece of steel against an anvil?

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