[GSlob]

"I don't know enough about whether it works just to shoot an IED."
Depends. From my ages ago training in explosives, if one can shoot through a detonator, then yes, even a regular rifle bullet would work. But the probability of hitting the sensitive detonator [especially if the IED is hidden] is zilch. Thus, [just as for an aviation bomb], one is more likely to hit the body of relatively insensitive high explosive. To cause reliable detonation in such a case one needs either a hypervelocity projectile [not available] or a projectile which is itself explosive and would serve as a detonator, i.e. high explosive round- like decent-sized HEAP, if I remember the acronym. If IED is hidden in a pile of bricks, I'd go for 20mm HEAP, no less.

[archy]

To cause reliable detonation in such a case one needs either a hypervelocity projectile [not available]

Yes it is. Works just fine in 7.62x51mm NATO and .50x99mm Browning-family weapons, other than those with a muzzle break, which unfortunately includes the M107 Barrett semiauto .50 AMR.

But for most explosive charges, the Mk211 Mod 0 .50 Raufoss ammunition will do just fine, and nicely detonates either high explosive or flammible targets, including JP4 and JP8 jet fuel. Shooting old Soviet TM46 and TM57 15-pound antitank mines at a couple of hundred meters with .50 Raufoss is great sport, and spectacular.