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Q&A · Hunting

Can cold weather affect the performance of TSS shot?

April 5, 2026

Quick Answer

Cold weather can affect the performance of TSS shot by causing it to be less effective.

Cold Weather and TSS Shot Performance

TSS (Tungsten Super Shot) is a type of high-density shot commonly used in sub-gauge shotguns for waterfowl hunting. In cold weather, TSS shot can become less effective due to its unique properties. TSS shot is designed to retain its shape and maintain its velocity at close range, but it can become brittle and less aerodynamic in cold temperatures.

Effects of Temperature on TSS Shot

When TSS shot is exposed to temperatures below 40°F (4°C), it can start to lose its shape and become more prone to breaking apart upon impact. This can lead to reduced patterns on the target and a decrease in effective range. For example, studies have shown that TSS shot can lose up to 25% of its density at 0°F (-18°C). To mitigate this effect, hunters can use a choke tube with a tighter constriction to help maintain the shot’s pattern.

Techniques for Effective TSS Shot in Cold Weather

To ensure effective performance of TSS shot in cold weather, hunters can take a few precautions. First, they should use a choke tube with a tighter constriction to help maintain the shot’s pattern. Second, they should use a slower-burning shotgun primer to reduce the chance of the shotgun’s action freezing in cold temperatures. Finally, they should use a shotgun with a gas-operated mechanism, such as a semi-automatic or pump-action, to help prevent the shotgun’s action from freezing in cold temperatures.

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