Others have asked and I have often wondered what happens when one of these 2-diameter bullets is fired. What happens to the transition between the groove diameter base and the bore diameter shank.
My .40-65 2-D PPB has just a sharp step at this transition so it was even more interesting to see what it looks like.
First the as cast and after patching bullets. It starts out at 1.250" long and .394" and .402" diameter. From nose tip to the diameter transition line is .760"
Then the one I found in the melted snow bank earlier today. After recovering it is 1.217" long, .4065" diameter for the length of the engraved shank. Just a faint line remains of the step. It measures .750" from the nose tip to the line (step).
This bullet is currently shooting into 1 MOA 10-shot groups at 200 meters and that repeatable accuracy. I know a few people who laugh at the 2-Diameter PPB idea, but they do work.
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