>>5433444>>5433472On one of the old qtgs I mentioned Delta Green has a good percentile ammunition dice roll mechanics - maybe look into the old and also modern edition rulebooks for some ideas.
If you want to get a little morbid, I researched this random blog once
https://www.ammoman.com/blog/why-do-police-shoot-to-kill/https://www.buckeyefirearms.org/alternate-look-handgun-stopping-powerI do not think this data is statistically rigorous (bias in terms of what incidents gets sampled and reported publicly etc) but this was just a random blog I found. In an urban area with fast access to medical treatment / hospitalisation ambulances etc survivability is actually surprisingly high. You could translate these probabilities to a percentile system like Delta Green rpg.