Hello! Im not sure if this is the best place to be asking, but I will try anyways. Im going to making a tabletop RPG campaign set in a post apocalyptic post WWI setting, after a deadly zombie outbreak began only a few months after the war ended. Obviously, im going to need a list of bullets that were used in civilian/military weapons. If you could also tell me what those bullets were used in (bolt rifles, LMG's, revolvers, etc) I would greatly appreciate it. The setting would be in the ruins of London.
To narrow it down further: I dont need every service round, I really just need the most common ones. I also dont need every civilain bullet. Again, just the most common ones. Any weapons development ended (weapons development as in the invention of new cartridges and guns) ended in roughly of June 1919 (when the outbreak really began to pick up steam and start to affect the world as a whole).
If this is not the appropriate place to ask, I apologize. Simply tell me, and I will take this down. If I need to narrow this down further, or clarify some things, please simply ask, and I will do my best to do so. Thanks in advance.
Footnote: American weaponry would still be available to the survivors of the United Kingdom as during the later stages of the infection (the outbreak began in the U.S) the U.S basically evacuated to the U.K, bringing a majority of its surviving military and equipment with them.
Most service rifle calibers of the time were functionally identical the same as what was used in machineguns, so it may be easier to abstract things towards categories of "rifle," "pistol," and "special" ammunition - things like the armor-piercing "K" bullet the Germans developed or incendiary and tracer ammunition.
As far as service cartridges one would expect to see available in some capacity in Western Europe at the end of WW1, we have
In England specifically, there existed a few non-standard rounds in circulation due to high demand for rifles early in the war. Most prominent among these would be 6.5 Japanese, which was procured (along with Arisaka rifles) early in the war to free up rifles then serving aboard Royal Navy ships.
I'm less familiar with pistol ammunition of the time, but there was a much larger variety of pistol ammunition in circulation at the time for numerous reasons. The .455 Webley cartridge of the British Webley revolver was likely the most common among the British, but on the continent cartridges like 9x17 (.380 ACP) and .32 ACP were popular in commercially produced pistols. Americans brought over the .45 ACP-chambered 1911 and a variety of older revolvers in several different calibers. The German standard pistol cartridge was 9x19mm Parabellum, although 7.63 Mauser was also commonly used.
.303 British
30-06 Springfield
8mm Mauser (really 7.92x57mm)
6.5mm Carcano
7.62x54R
9x19mm Parabellum
.45 ACP
.455 Webley
Those are some of the most common at the time period but there are a lot of wacky rounds from smaller countries that saw less use. Lots still in use today too as well.