Quick Answer
Select a choke with a tighter constriction, such as an extra-full or super-full choke, for bismuth loads to optimize patterns at longer ranges. This is because bismuth tungsten loads tend to break up more quickly than lead-based payloads. A tighter choke helps to maintain a denser pattern.
Choosing the Right Constriction
When selecting a choke for bismuth loads, consider the constriction size and its intended use. For example, if you’re hunting waterfowl at medium ranges, an extra-full choke with a constriction of around 0.75-0.80 inches is a good option. This will help to maintain a dense pattern out to 30-40 yards. However, if you’re targeting larger game at longer ranges, a super-full choke with a constriction of 0.80-0.85 inches may be more suitable.
Considering Pattern Density
Bismuth tungsten loads tend to break up more quickly than lead-based payloads, resulting in a less dense pattern. To compensate for this, a tighter choke constriction is necessary to maintain a more consistent pattern. A good rule of thumb is to start with a tighter constriction and experiment with different chokes to find the optimal pattern density for your specific load and hunting conditions.
Factors to Consider
When selecting a choke for bismuth loads, consider the following factors: the type of hunting you’ll be doing, the range at which you’ll be shooting, and the specific load characteristics. Additionally, keep in mind that different choke manufacturers may have slightly varying constriction sizes, so be sure to consult the manufacturer’s specifications when selecting a choke.
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