I think one example to the artillery wounds being indiscernable from to gunshot wounds theory was in my family
My ggg grandfather was killed at Gettysburg within minutes of the Confederate artillery barrage being unleashed on the Union troops posted along the Emmittsburg rd at the Klingel house,,,,the assistant regimental surgeon reported his cause of death as "vul sclopet",, yet infantry attacks had yet to occur. We have since discovered the soldier next to him (the only other member of that unit to be killed that afternoon ) had much of his head taken off from a nearby shell explosion. My ggg grandfather was also killed in the same explosion,,But his records list vul sclopet, and now we aren't too convinced of that, given the fact that the Confederate infantry hadn't yet engaged when a gunshot wound to the skull supposedly killed him, yet his "neighbour" was killed by a shell explosion at the same time. Could very well had been a small piece of shrapnel that got each man, and without an autopsy, it looked to the surgeon like .58 caliber bullet wound