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I am buying one here on the forum and the seller is traveling. So is it P&R or not? Does not make a big difference, I am still going to buy it.
Only black powder cartridges used balloon head cases. Magnums were made for use with smokeless powder and never utilized balloon head cases. I wasn't there in 1935, but I suspect that the counterbore was more about what MIGHT happen - an engineer's CYA design feature. It is still a good design for rimfire revolvers.Also, a lot of older caliber cartridge cases were balloon head design, meaning there wasn't all the extra brass around the primer pocket that there is today, so the recess was designed to help support the case head, and keep the brass from blowing out there. It is totally superfluous today.