Imagine an expanded hollowpoint spinning like a top as it progresses through flesh.Interesting just how much energy is stored, and wasted, in rotation, and how little resistance to it there is in flight. We can stop ALL forward motion and still prove there is energy present.
A 1:10 twist would only spin once through 10" of whatever if it retained it's original muzzle velocity. I'm too lazy to figure out how many turns it would make when it slows down, but if it went through at half MV, it would turn twice in 10".Imagine an expanded hollowpoint spinning like a top as it progresses through flesh.
Someone must have a slo-mo of that sort of process in ballistic gel. I suppose the spinning would stop pretty quickly due to the resistance of meat or gel.