Thanks for all the good information. I will not touch the chamber and try the gun with some light target loads. There were several references to "these light 20s", I weighed this one at 7 pounds. When I said there were 40 percent case colors let me say that I did not think the colors were that brilliant. I will try to post some pictures when I figure out how to do it.
Regarding the question how I measured the chamber length, I used a starrett telescoping gage set to .685 diameter and placed it into the chamber until it stopped, then I measured the depth on the handle of the gage. thanks again
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