Back again in The nice aged times, the bullets Employed in factory-loaded cartridges had been both simple direct round-nosed, ordinarily abbreviated as LRN, or totally jacketed having a metal sleeve above the lead, that's why the expression entire steel jacket or FMJ. For people who wanted a more effective round, https://redgearguru.com/can-50-caliber-armor-piercing-rounds-stop-a-tank/