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Since this ammunition’s velocity is below the speed of sound there is no supersonic “crack” as the bullet leaves the barrel and breaks the sound barrier allowing for a very quiet report when shooting suppressed. The base of the total metal jacket bullet also keeps the lead core at the base of the bullet encased in copper reducing amounts of lead from being deposited into the air and make this a bullet acceptable for use at indoor ranges which often require TMJ ammunition. As with all Peak Performance’s 300 AAC BLK ammunition it is loaded used 5.56 Lake City brass which has been converted to 300 AAC BLK and hand inspected ensuring a safe, and reliable subsonic ammunition choice. Peak offers their 300 AAC BLK 220gr TMJ in 100, 250, 500, and 1000 count quantities.