Mixed bag, and some head scratching on how to proceed. You can see in the first picture, the land indention stops well before the case mouth: lots of freebore. In the second picture, another land goes all the way to the case mouth. 3 of the 6 lands go all the way to the case mouth, one is relatively near, and two are as shown in the first pic.
The chamber itself, minus the base thickness of the case is 2.085”: when adding the .07” base thickness the brass to fit exact chamber is 2.155”.
Groove Diameter, as measured with my Shiny Jap calipers, and outside Micrometer measured out at @ .4625”, with a few slightly deeper and a few slightly shallower: not .458” I expected.
Bore Diameter: that’s a tough one. Had so much trouble trying to measure inside those grooves with my dial calipers I can’t reliably say, though I got .453” several times. I’d need one of those “point Micrometer’s” to take the measurement to be more sure.
I wish to paper patch, and preferably BP. With some lands continuing to case mouth, and others as far as ”.05” from case mouth, what to patch to, DDPP? I really want to hear recommendations from you guys who’ve been through this journey. Given the weird land readings, whatch’ya think?
Cheers
John