Speer Total Metal Jacket Round Nose bullets are engineered to be the cleanest-shooting plinking projectiles on the market. Unlike traditional FMJ bullets that leave an exposed lead base, the TMJ design uses the Uni-Cor process to completely encase the lead core in a seamless copper jacket. This significantly reduces lead vapor at the firing linemaking it ideal for indoor rangesand prevents lead buildup in compensators and gas ports. At 110 grains, it is the classic weight for the .30 M1 Carbine, but it has also become a favorite for 300 Blackout owners looking for a reliable, cost-effective projectile for high-volume target practice. Defensive Application Non-expanding TMJ bullets carry a high over-penetration risk and do not create large wound channels. They are not recommended for personal defense.