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Pawpaw wrote: . . .

Added to that is that each projectile is only 1/3rd the weight of the original bullet. In the case of .45 ACP, a 230gr bullet breaks up into three 76gr "flying wings". How much penetration do you think you'll get from that light a projectile, flying at maybe 850 fps and hitting the target broadside?

No thanks. This stuff makes a neat pattern when it hits a paper target, but it's just going to tick off a real BG.

Exactly what I was saying, except. The center projectile has some of the original mass too, so 1/4 of 230 = 57.5 and the mass of the string, alothough light, would have to be taken into account.

And then some of the energy of the projectile is expended spinning the ends out, rifling can't do it all, watch, in the upcoming Olympics, how spinning figure skaters slow down, they extend their limbs, and pull them in tighter for faster rotation.

A neat idea, very glitzy, but still a solution looking for a problem.

I can't imagine it being all that effective. First of all you are dividing a projectile that's already light to begin with, into four pieces. Even assuming a negligible mass for the "string" you now have four much lighter projectiles whirling around on the way down range. The first one to strike anything will pull the rest off target unless they all strike at virtually the same time (and we know this because "chain shot" has been used in naval warfare, and bolos are used on the Pampas.)

So you divide your typical 9mm round into four chunks and then there is the big jump in wind resistance, and suddenly you can see the thing fly through the air and duck it. Well, maybe that's overstating things a little, but this sure looks like a solution looking far a problem to me.

OTOH, in a 3" magnum 12 ga shotgun shell . . .