Which effect increased the firing range of early gunpowder cannons employing windage gap between the ball and barrel?

💡 Explanation

When windage gap exists, burning propellant gases leak past the projectile, and ignite unburnt powder in front due to turbulent mixing; this augmented the secondary explosion effect pushing the projectile further. Therefore greater range resulted, rather than spin, confinement or trajectory, which depend on tighter tolerances.

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