The Rio Bismuth Fiber 28 Shotshell comes in a 12-gauge size, measuring 2_ inches long. These shotshells are loaded with shot sizes #4 through #6, and they achieve a muzzle velocity of up to 1,350 feet per second. These loads are also available in the Bismuth 28 standard form. If you are looking for a shell that delivers a combination of hard-hitting payloads and unmatched down-range power, look no further than the Rio Bismuth Fiber 28 Shotshell. These shells are compatible with your treasured vintage firearm, and they are also a great option for nontoxic waterfowl hunting.