I admit to being a former field artillery 13A type who instructed at Weapons Dept, USAFAS in the early eighties and commanded a M101A1 battery later. I'm somewhat dismayed by the width of the sheafs fired by the German 105mm systems, which were comparable to the M101 system. They appear wider than my experience. I was trained in a manual fire direction environment at a time when the FADAC computer was the extent of our automation. I later served in a 155mm battalion that had TACFIRE at the battalion FDC. Appropiate enough for the types of missions we shot.
Still, our KIWI gunner is correct, for the most part. Modern fire direction lends itself to the automated computation of circular sheafs, for the obvious motive of increased/enhanced lethality. Modern fire direction systems are so much quicker, thus the circular sheaf becomes both practical and desirable. Piece displacement corrections make the new battery position unrecognizable to a Vietnam/Korean/W.W.II vet, yet still attack a circular sheaf 140 meters in diameter.
Not so back in the day. Individual gun corrections to achieve that accuracy would have mangled the FDC, and the fire commands to the guns would have been simultaneously confusing and tedious to all but a battery manned by experienced section chiefs from top to bottom. Gun formations, therefore, would reflect the sheaf downrange. For me, every photo of a German, Soviet, or U.S/British battery showed line or lazy W formations-best command and control, communication (FDC wire only to the X.O in many cases!) & deployment considerations. I actually much prefer the 120mm as my direct support indirect fire weapon of choice, and avoid . Much faster response (1-2 minutes instead of 3 minutes), faster rate of fire, tighter sheafs, and greater lethality. I don't agree with the 120mm faster response, however. Initial computations would be as slow, or slower in a 120mm platoon FDC, following the initial call for fire request.