Time to revisit tubular ammo?

Some of the recent conversations here about optimizing ammo in general and military ammo in particular got me thinking about Abe Flatau's tubular ammo ideas. (See e.g. http://www.dtic.mil/ndia/2004solic/flat.ppt). Based on what I've read about copper PMC Ultramags and steel "Cyclone" bullets of Waco fame, a .50 Beowulf launching a tubular bullet should be pretty effective against unarmoored, soft-armored and lightly hard armored targets and shoot flatter than traditional bullets of a similar mass. Of course the obturator/pusher creates safety issues similar to those related to sabots.

Maybe I should combine this and my explosively formed projectile posts in one thread on future small arms technologies...

Some of the recent conversations here about optimizing ammo in general and military ammo in particular got me thinking about Abe Flatau's tubular ammo ideas...a tubular bullet should be pretty effective against unarmoored, soft-armored and lightly hard armored targets and shoot flatter than traditional bullets of a similar mass.
While tubular bullets reportedly penetrate flesh well, there have been questions raised about incapacitation potential.
Of course the obturator/pusher creates safety issues similar to those related to sabots.
Also has cost issues similar to sabot rounds.