I have gone through many things I know and cannot find this headstamp.
50 cal round american made (I believe) headstamp is
U (at the 12o'clock looking at it)
4 (at the 8 o'clock)
3 (at the 4 o'clock)
I know a pic would be better, but I am unable to get a clear one, very old and was dound in salt water/dune area at low tide. I am not completly sure about posting this here, so I am going to try another spot on the forums as well. Thanks in advance if anyone can help me...I just can't find a match with any others I have seen.