I wonder back during that shootout in LA where two armored car robbers armed with converted Polish AKs and wear massive amounts of body armor ended up in massive firefight with LA police... If the police had a rifle loaded with 45-70 charged with 500 grain bullets could have taken out both of them with only a few shots?
I don't have any proof of the story but according to a friend of mine who was SF in Vietnam and a retired LEO who worked Fayetteville and later Western NC one of the first murder cases he worked was fellow officer who was shot with a 45-70.
Seems the officer pulled over a suspected bootlegger who then shot him in the chest with a standard pressure 45-70. When the officer was found several hours later the responding officers/EMS found that the round didn't penetrate the vest but did push the soft armor into his chest cavity far enough to shatter the sternum, rupture his heart/aorta, and physically tear the skin open.