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Hi, I found this shell casing and another one just like it a couple weeks ago and although I hunt and know a good amount about firearms I really don't know what type of shell this is or the age of it.Can anyone out there positively ID it?I realize that bullets are usually measured in MM but all I have to measure it with is a standard tape measure.It is 15/16" long and the base is 5/8"Diameter and the top is just a little over 1/2".There is a "U" stamped on the base and notice it is a rimfire casing like a 22 but waaaay bigger.The quarter is for size reference only.Thanks in advance for your help. HH, Bootstrap