RIO Ammunition?s Bismuth game loads are a premium non-toxic option for those who shoot older or classic shotguns where steel can be an issue. A major benefit to Bismuth is it causes less damage to older barrels preserving your investment and inheritance for longer. Perfect for where lead is not an option RIO?s Bismuth loads perform in the worst weather conditions and are available in the best shot sizes for hunting duck and geese. RIO Bismuth is available in a wide variety of payloads in 12 16 20 and 28 gauges and .410 Bore including a 12-gauge 1-ounce load with an eco-friendly fiber wad.