cute, hmmm casing thickness variation will cause cracks :)

http://en.wikipedia.org/wiki/Dardick_tround

Have handled and fired a lot and haven't seen one of those. Interesting though.

Exactly why I chose it for the RD-44 =D

Reloading a mag while fighting off zombies one handed is hard enough as it is without them rolling away on you, finally a solution! My concern would be twofold. The first has already been brought up. A casing is only as strong as its weakest point and if the walls are thick at the corners and thin along the facets of this triangular prism shape the strain would be transferred there and there would likely be a failure in the form of cracks or just an exploded casing. Now, if you made the walls of uniform thickness but the casing is still in this triangular prism shape the detonation of the powder would force the casing to balloon INTO a more cylindrical conformation or just rupture. A cylinder is marvelous at taking the force of an explosion much like a dome or arch. Triangles are also strong if you want to make something to bear load in a single direction like a pyramid or the steel latices on a bridge but will want to bow out along the sides if force is applied equally in all direction.

The nose of it is the only non uniform part for it holds a round bullet. Baz did not define the interior much so I made it how I think it would work. The pic on the left you can somehow see the interior shape in the reflection. You can see its mainly uniform, then tapers down to gently direct force to the bullet skirt instead of to a flat wall. If it works in the real world though is irrelevant

It's essentially a normal bullet, casing and all, in a triangular sleeve. Dardick had no problem with it when he made the Tround =P