Quote:
I still don't understand how the ring cut from the .380 inch ball somehow manages to get pushed into the cylinder, when the .375 doesn't.
His description needs clarification.
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I certainly agree with that. I assumed, from his description, that he wasn't getting a cut ring with the .380. Rather, the ball was deformed, or obdurated, by the excess lead cold flowing to form a sort of 'collar' on the front face of the ball. I've had this happen with significantly oversize soft lead slugs used to measure barrel and chamber dimensions. But that's just guessing. As you noted, it's not really clear what's happening.