In the good old days, when smoking was allowed on commercial flights, the aviation mechanics found minute leaks by looking for nicotine stains on the outside of the fuselage.
I don't believe that much has changed since the jacketed lead hollow point was invented.
Most of those advancements are approaching 20-30 years old.JHP bullets have improved substantially, offering significantly better reliability through clothing and other barriers and more consistent expansion and penetration.
Right.The most recent innovation in handgun projectiles that actually performs well is the solid copper hollow point (like the TAC-XP) and that's not much newer than the Gold Dot and HST.