Quick Answer
Shotgun slugs can be incompatible with slug barrels if the rifling is too aggressive, causing keyholing or poor accuracy, while a milder rifling pattern can improve slug performance.
Slug Barrel Requirements
For optimal performance, a shotgun slug barrel should have a rifling twist rate of 1:18 to 1:20 inches, which is milder than the typical 1:12 to 1:16 inches found in rifled shotgun barrels designed for birdshot and buckshot. This gentler rifling helps to stabilize the slug and prevent keyholing, which can occur when the rifling is too aggressive. A milder rifling also allows the slug to maintain its aerodynamic shape and reduce barrel friction.
Slug Types and Barrel Incompatibility
Some shotgun slugs are designed specifically for use in rifled barrels, while others are better suited for smoothbore or milder rifled barrels. For example, sabot slugs with a polymer or plastic coating can be used in rifled barrels, but may not perform well in smoothbore barrels due to the risk of the sabot deforming and causing the slug to keyhole. In contrast, non-sabot slugs, such as solid copper or lead slugs, are often better suited for smoothbore barrels, where they can maintain their aerodynamic shape and accuracy.
Tips for Choosing the Right Slug Barrel
When selecting a shotgun slug barrel, it’s essential to consider the type of slugs you plan to use and the performance characteristics you need. If you plan to use sabot slugs, look for a barrel with a milder rifling pattern and a 1:18 to 1:20 inch twist rate. If you prefer non-sabot slugs, a smoothbore barrel may be a better choice. Always consult the manufacturer’s recommendations for specific slug types and barrel compatibility to ensure optimal performance and accuracy.
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