That's quite an interesting test you come up with there. Would it be safe to assume then that all those MLs have the same size rifleing groves, I mean is there any standard as far as the number of rifling lands and their width( don't mean depth I'm sure there has to be variation there). I guess I'm just very suprized that the rifling marks in that conical matched up with that many different MLs. I must addmit I thought there would have been a bigger difference brand to brand in the number of and size of the rifling lands.
That's whats so great about this forum there is so much to learn. Although the more I learn from you guys here the more questions I seem to have.