[imardmd1]

I dunno how great this is. Back in the early '60s our 81mm mortar (WWII version) placed the third ranging round directly on the turret of the target tank at 1700 yards. I was the forward observer running the M-1 plotting board and issuing the firing parameters. That's good enough to fire for effect, I think.

Within 2 yards/meters at 1700 yds/1555 meters accuracy would be about within 10 meters at 8 km. Under more adverse conditions that would seem to be outstanding.

From the USMC manual on Tactical Deployment of mortars:

a. If a 60-mm mortar round lands within 20 meters of a target, the target will probably be suppressed, if not hit.

b. If a 60-mm mortar round lands within 35 meters of a target, there is a 50 percent chance it will be suppressed. Beyond 50 meters, little suppression takes place.

c. If an 81-mm mortar round lands within 30 meters of a target, the target will probably be suppressed, if not hit.

FWIW

A 120mm proximity fuzed round within 25 meters on the first ranging round would probably be quite awesome.

[The Antiyuppie]

I would think that such a device with a “second stage” like an RPG at the zenith of the trajectory would make a super tank killer (the tops of tanks are not armored as well).