I am as new to shotshell and cartridge collecting as anyone can be. I have recently joined the IAA. My question. I have a 12 ga brass shotshell. The headstamp says UMC Co No 12. The casing measures 4" long. My meager references have no mention of anything like this. Does any one have any sites/information that can lead me to learning more about this shell and it’s possible date ?
Here is picture of 4" 12 ga w/2.4" 12 ga.
HS of 4" 12 ga casing.