I'm making a mod that introduces some different ammunition varieties, with both different calibers and manufacturers. I've found Buckslayer and (G) in Fallout 3, although I don't know what G might stand for. I don't want to spoil it with too many new names if there are more that existed in Fallout's history. Is anyone aware of any others?

7.62x51mm NATO was common during Fallout 2(as the NCR's primary infantry weapon was the FN FAL).

That would be the .308 ammo the sniper rifle uses.