I have what I think is a Winchester .45-100 cartridge. The headstamp is “R” at nine-o-clock, “M” at twelve-o-clock, “C” at three-o-clock, and “3” at six-o-clock. ?any body know what this is?
I was hoping someone would chime in with what you have there so I could learn something! Any chance you could get a photo of the headstamp and side view of the cartridge posted?
W&M “Cartridge Headstamp Guide” shows this headstamp as their Number 1579, on page 175 (original Edition), as:
“Unknown. Believed to be of U.S. origin. On .45-90 Sharps sporting ammunition.”
Unfortunately, I can provide no other information than that, nor confirmation of the caliber.
Rob Buttwieler identified this as the .44 Remington number 3 Military Creedmoor