Are there any markings stamped in the wood, such as 'BGI'? These blocks were also commercially produced by various manufacturers to facilitate the different stages of shotshell loading, specifically, decapping, charging, wad seating and shot. Hopefully, the over-shot card would keep everything in place while removing the hull from the block prior to crimping. Crimping would then be performed with one of the many rollers available.

GMC(SW) - USN, Retired (1978-2001)