I received the following email asking for information. I have never heard of this round. Can anyone provide information and a picture?
Sir: I have cartridge that I cannot identify (510 “Beecher” Express)).Bullet weight appears to be 600–700 grns. It is not a belted nor a rimmed case! The case length is 3.25, overall loaded length is 4". Have you any info about this cartridge? Thank You