A couple more photos to flog the horse some more.
I got bored last night and took the 124 grain 9mm RN, blackened it with a sharpie and loaded it into a resized WW .357 Sig case to my normal "load to" length. I then used a knife to mark the location of the case mouth on the bullet. Next, the bullet was extracted using a kinetic puller (one whack) and measured to get the bullet diameter at the mark, as well as where the contact marks started and where the bullet reached its full .355" diameter.
The expander ball diameter is .353". From my readings, the full .355 bullet diameter was at or below the shoulder of the case. The diameter at the case mouth was .345". The diameter of the bullet at contact with the case neck was .353". Essentially no neck tension. If this had been a loaded round and chambered, the bullet would have likely set back and a potentially dangerous high chamber pressure would have been the result.
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