https://www.luckygunner.com/remington-45-acp-ammo-for-sale-45acp230mcremumc-250

Details Subsonic ammunition like this .45 ACP load from Federal is the ideal choice for use with suppressed firearms. A suppressor is the perfect tool for eliminating the noise of a cartridge being fired, but it cannot stop the "crack" of a bullet crossing the sound barrier. By using subsonic ammo that never reaches that barrier, you can achieve optimal noise reduction for a more pleasant shooting experience! Each round in this case of 500 fires a heavy 230 grain full metal jacket bullet at a muzzle velocity of about 840 feet per second. This is well short of the approximately 1,100 fps sound barrier, ensuring that you will get subsonic velocities even in longer-barreled handguns such as extended-slide versions of the 1911 and Glock. This ammo is loaded in Anoka, Minnesota, where Federal Premium Ammunition has been headquartered since the 1920s. It uses non-corrosive primers and reloadable brass cases.