I saw the picture in the Vortex thread in the Campfire, and wondered when we'd get the rest of the story.
Good going on Riley's part! But man, I must be getting old, 'cause he looks about ten years older than the last time I saw him, and that wasn't all THAT long ago.
That almost looks like an inside lubed bullet, but for the fact that those look like crimp marks in the middle of the band.
Can you count the number of lands/grooves? If so, why not use calipers to measure the respective width of the best samples and then multiply to get a better estimate of the original circumference.
Scott
