Mr. T,
I'm not sure that what you are saying is true or what you are seeing! There is some measuring guesstimation in my numbers, having to measure at an angle from the nose tip to the step. The groove diameter base is maybe .005-.010" shorter on the recovered bullet than a unfired one. When I compare the two bullets side by each the nose of the recovered bullet is noticeably shorter and it is difficult to see any difference in the base length. With calipers I can measure a very small difference in the base length, maybe. On the recover bullet the step is just a line and not something I can "feel" with the calipers.
The base diameter really doesn't bump up in diameter at all and indeed is groove +.001" as patched so it fits the freebore and case snug. All it really does is get engraved by the rifling.
Also interesting is that the wrap around gap in the patch, which was very narrow, can be seen one the recovered bullet as a very thin line and the taper crimp leaves a faint line at the base, but the 45 degree chamber stop lease nothing I can see!
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