Can You Use Bismuth in Inertia-Operated Shotguns?

Choosing the Right Bismuth Shot

When selecting bismuth shot for an inertia-operated shotgun, the key is to choose the correct size. Bismuth shot is typically available in 2.75 mm, 3.0 mm, and 3.5 mm sizes, which are designed to work with specific choke systems. For example, a 2.75 mm bismuth shot is typically used with a tighter choke system, such as a Modified or Full choke, while a 3.5 mm bismuth shot is better suited for a wider choke system, such as an Improved Cylinder or Skeet.

Wad Selection and Loading Techniques

The wad used in conjunction with bismuth shot is also critical. A wad that is designed to handle the density of bismuth shot is essential, as it will ensure that the shot is properly contained and that the wad separates from the shot at the correct distance. When loading bismuth shot, it’s also essential to use the correct amount of powder and to follow the manufacturer’s recommended loading techniques. A general rule of thumb is to start with a lower powder charge and adjust as needed to achieve the desired velocity and pattern. For example, a 12-gauge shotgun loaded with a 3.5 mm bismuth shot might require a 2-3/4 oz. powder charge, while a 3.0 mm bismuth shot might require a 2-1/2 oz. powder charge.

Safety Considerations and Performance

When shooting bismuth shot, it’s essential to wear eye and ear protection, as the shot can be quite dense and may cause injury if it hits the shooter or bystanders. In terms of performance, bismuth shot can provide excellent patterning and density, especially when used in conjunction with a choke system that is designed to work with bismuth shot. However, the performance of bismuth shot can be affected by a variety of factors, including the size and type of bismuth shot, the type of wad used, and the loading techniques employed.