Worse: the Soviets had a postwar nuclear round for their 152mm howitzers, just as we had one for our 155mm howitzers and SP guns. I once saw a West German M109 battery fire their 155's direct fire on the *Table 8* tank gunnery range at Graf, firing concrete-filled dummy warheads, Yeah, they bcould hit, direct fire, at ranges of 1,500 meters and up.
I remember our M109A1, 155mm, battery going to a tank range at Graf to practice direct fire. I was a 13E, fire direction center, and was there in our M577 FDC track. I also recall many hours doing nuke fire mission calculations AND being trained to assemble those rounds.