Buffalo Bore subsonic 9MM Luger ammunition was designed to fill the need for full power suppressible ammo. While this ammo is full power, it is “Standard Pressure” and falls within the SAAMI guidelines of 35,000 PSI, so it is designed for use in ALL 9MM handguns, suppressed or otherwise and will not cause accelerated wear in your firearm. This 147gr FMJ-FN bullet will not mushroom in mammalian tissue at these impact velocities and will penetrate roughly 30 inches, depending on how much bone is struck and how much clothing must be penetrated. This is enough penetration to incapacitate even very large men that are heavily clothed and are struck at bad angles. Since it non-expanding, this bullet is designed to defeat soft cover such as stick frame walls, car doors, sofas or other types of items any perpetrator may have jumped behind during a gun fight. In a fight, there can be advantages to ammunition that will shoot through cover. Expanding bullet designs are not as reliable for this type of work. This FMJ-FN type of bullet design can also be advantageous for use as an “outdoor” type load as it will pierce a bears skull and keep going. For those wanting an easy shooting, full power, standard pressure 9mm load that will penetrate deeply and is designed for all 9mm pistols, this is it. This ammunition utilizes a flash suppressed powder that will not substantially affect your eyes in low light, which is when most civilian shootings occur in the US as that is when the criminal element is most active. This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.