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Originally Posted by MadMax
With electrical ablation, you can do crazy stuff like progressive rifling which varies the helix angle from beginning to end. Start with a gentle helix and end with a steeper one so you apply a more constant torque on the bullet as it accelerates down the barrel. SVI does that I think.
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That's known as gain rifling. The M61 Vulcan cannon barrels use this (among others I imagine) to minimize the initial rotational torque on the projectile.