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Some .40 caliber bullets are supersonic and some are not; it depends on the load. Generally lighter bullets (155 grain or less) will be supersonic, and heavier bullets (165 grain or more) will be subsonic, although there are a couple 165 grain bullets out there with advertised velocities about equal to the speed of sound.

No matter what bullet you purchase, if you feel like subsonic/supersonic is a difference-maker to you, then check the manufacturer's specifications on the ammunition you're purchasing.

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Q: Are 40 caliber bullets supersonic
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