These grooves grab the walls of the smoothbore barrel in order to impart spin on the projectile and send it flying downrange with precision. The rounded dome-like head of the slug helps it resist drag in-flight and also ensures successful entry and penetration deep into a deer or wild hog. Since the slug bears no coat, it is likely to expand during entry, yaw in direction, and deposit its momentum into vital organs in order to yield a humane drop on game.
Review by JMP
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