Ok so last post I said variant ammunition for the syringer but I have another thought that may be a great addition

A 1911 pistol: a seven shot pistol that is slightly stronger then the 10mm but incapable of having the amount of mods as the pistol. 45.

German Luger: a 9mm pistol that can be fired quickly and is extremely simplistic, but fails to match the raw damage of the 1911

Trench shotgun shells: during 1912 incendiary rounds were made for the 1897 remingnton or the pump action as it is known in fallout 76. These leave a burning effect and can be crafted from shotgun shells and fire caps

Anti tank 20mm: this is something that could be found in high tier areas and shreds through armor but it’s rare ammo combined with it’s need for cover to control recoil has made it only useful when ambushing

And finally the c96 Mauser: it can be called the Chinese pistol since they used German weaponry and made variants of their own. It takes time to get a good shot off but the rounds are as strong if not stronger than 44 if you can handle the recoil and(if nessessary) full auto blast