![]() One thing that makes full metal jacket rounds so attractive is that the outer metal jacket of an FMJ round reduces the amount of metal deposit in a firearm’s bore or barrel. FMJ is the most common type of ammo that you can purchase today. They were a significant technological improvement over the existing lead-based bullets.įull Metal Jacket ( FMJ ) ammunition consists of a soft lead core encased in an outer jacket (or shell) of a harder metal. Full metal jacket rounds were initially developed in 1882 for the Swiss military.
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