Me: Hmm, I wonder if I could build a database of fictional firearms in "my verse"
Also Me: Hmm, I wonder how hard it would be to make a chart to show how rounds from said weapon would effect various armor levels
Also Also Me: Oh hey I have 100 unique guns in here now...
Odds are if you have a favorite Cold War-era firearm there's probably either an equivalent or it's directly in there.