PB
I went back and re measured - seems like my farm grade measure was a bit on the agricultural side (like rougher,n a plowed paddock)
could not find that rim I said was spot on .600
Soooooo I got two batches of brass here (no idea which is wot or where - they are allasame winchester headstamp) those two lots would be at least twenty years different age manufacture - yeah thats a story I tell ya one day - one batch - the newer I think - has rim diameter pretty consistent at .6035 to .604 a few getting out to .606
rim thickness of those near as I can figure is about .062 to.065
other lot - the older I think (wild ass guess which is which) rim diameter runs .607 to .609 and thickness about .067 to .069
I have a Uberti - delivered new off the boat in 2016 - has ZERO extraction problems with this brass.
One qualifier - the neck part of my chamber is really, really neat to the load I am shooting - only just chambers - its neat enough that this stops the cases from flopping down in the chamber at the back and I get quite neat brass after it has filled out - the swelling at the back end of the case is pretty much even all around rather than a lump on one side like you see with most rifles .
My loaded rounds all go through a .485 neck swage die and finish outside neck diameter of loaded rounds is .4855. If I dont do that I will have problems chambering some rounds = little bit of a swelling under the crimp, or a teensy bulge at the base of the neck
I am mostly shooting as cast, or If I size = .460
The tight neck has been a bit of a headache at times but part of the reason this girl shoots nice I think. I dont neck size my brass at all once its fired - just that swage die to tidy things up.
Blackpowder only - mainly because it works so good I couldnt be bothered messing with a smokeless load