The trick I was told to use to figure out if a barrel crown has issues: shoot a bunch of lead bullets and look to see how symmetrical the marks are. Symmetry = good. Not symmetry = not good.
I have a 2.5" snub shoots hard to the left and after checking the marks recrowning seems like a useful thing. I broke down and ordered a frame wrench from brownells. I'll make mine after seeing how people who get paid money do it :).
I'm currently trying to get a near mirror finish on the muzzle of a junk python barrel (bore rusted, heavy pitting, etc). It's taking a bit longer than one could hope for.
Here's the damning evidence --- the previous owner was extremely uncareful (cleaning? Drop? Bang around in safe?):
You can see a nick in this photo:
For comparision here's four crowns. The one on the far left has a target crown Frank Glenn did to a shooter that had accuracy problems, fixing it. Then there's a blued 6", then the 2.5 snub w/ suspicious steaks, then an E nick. The crowns on these look roughly the same.
Here's the three stock crowns:
And some close ups of the two blued:
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