Out of the blue, a viewer contacted me about some aluminum slugs that he machined.
What is unique about these giant, .700" x 2" rounds is they have riflings milled into the
sides. There are 6 milled slots equally and perfectly spaced around the slug. The
machinist even went as far as setting them a precise pitches, or twists. The ratio is 1:28, 1:20, and 1:10. In other words, for every 28 inches, a 1:28 pitch will rotate one turn.
That may not seem very fast but at supersonic speeds, the spin should be enough to stabilize the rounds.
Since we use a smooth bore shotgun, there is no rifling so this may be a solution for
stabilizing the rounds. We do not know if they will work or not, and that is the fun about trying these experimental rounds.