The decision to order Captain Dance to use solid shot only, feels like an injustice. General Ramseur stated, 'exposed to the artillery of the enemy and our own short-range guns, by the careless use or imperfect ammunition of which I lost 7 men killed and wounded."
There is no possible way that he would have known who fired the shot(s) that killed 7 of his men, unless of course he witnessed the shell leaving the gun from Captain Dance's position. To use the term 'careless use' would imply that Captain Dance and his men were firing indiscriminately. If the shell(s) that killed and wounded the 7 men did come from Captain Dance, It is more than likely that they were defective shells, which was quite common for that period.
tmh10 has written a nice piece on Field Artillery in the Civil War 'There were stories of troops being hit by shells fired by their own side which burst prematurely, and that no doubt happened. Many times it was the sabot, a piece of the rifling band or just a piece which broke off the shell as the cannon fired which struck those troops. Many recovered Parrott projectiles have pieces broken off at the base, attributed to the force of being fired.
I feel better now because I have defended your relative, Captain Dance.