So, this 308 Win SUBSONIC round has almost the same energy as a 40 cal round, but fired out of a rifle platform. In comparison, a 40 S&W handgun round pushes the same weight 180 grain bullet about the same speed of 1040 fps as a 308 SUBSONIC round does. This round has about 430 ft lbs of energy at the muzzle, and about 380 ft. Take a SUBSONIC 308 Winchester with a 180 grain bullet going about 1040 fps. With these slower speeds, the energy of the round has been heavily reduced. To make a SUBSONIC round, the ammo is loaded to a much lower pressure to keep the bullet below the speed of sound, about 1000-1060 fps. (See “Energy of a SUBSONIC” round below).
When shooting this SUBSONIC round suppressed, the suppressor will muffle the bang, and the round will be very quiet. A SUBSONIC round will have no sonic crack. (The reason why a whip has a “crack”, is because the end of the whip breaks the sound barrier). When a bullet goes above the speed of sound (about 1110 fps), the bullet will now have a sonic “crack”, just like the end of a cowboy’s bull whip. When a bullet is going below the speed of sound, there is no sonic “crack” and the bullet has a very quiet flight. To allow for some variables in barrel lengths and such, my subsonic ammo runs about 1000-1060 fps. The speed of sound is about 1110 fps, depending on your exact environmental conditions. SUBSONIC, in terms of ammo, simply means the bullet is going below the speed of sound. With suppressors being very popular, I wanted to post some information about SUBSONIC ammo and the differences between subs and super sonic ammo, and shooting suppressed.
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