But those are polymer tips right ? Even though the bullet is jacketed that wouldn't be best for penetrating steel plate would it ?
If using a sabot you may as well just go for a solid steel projectile no ? At this close range flight characteristics shouldn't really come into effect.
Just beware of possible ricochets !
I would say the opposite,
I agree that a supported target dissipates less energy, but in this particular case looking at the relative size of the projectile vs the width of the rectangular tube, I'm not so sure. If it were just a bit wider I'd definitely agree.
Or... I have the sneaky feeling Petitlu can get hold of some tungsten rods
I think at least a one off sabot+tungsten dart shot is in order !