An IRU. Inertial Reference Unit would account for rotational, gravity and other factors involving the calculation of a trajectory because the trajectory of a bullet from a heavy gun would probably be close to a hyperbolic great circle route. I am taking a calculated guess in all this. Of course the bullet spin is for stability, but as far as which type of spin, would be interesting to see what the logic is behind a specific direction of spin. I know that during the war of independence American sharpshooters had rifled barrel, I think the brits did not.
Like I said this is all a calculated guess for me. Good luck in your research!
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