Rock salt shells Have got a famous name in gun folklore, but the truth is far less amazing than the tales counsel. Rubber Baton Rounds: 37mm rubber bullet rounds fire a singular round from the 40mm launcher using a low electricity propellant at 60m/s (200ft/s). The round is around 100g https://cheapest-ammo-calibers-2055432.pointblog.net/how-5-45x39mm-surplus-for-sale-can-save-you-time-stress-and-money-84090861