I just read this last week...I believe it was cited in Pfanz': Gettysburg, Day Two, but can't swear to it...
"We drop a comrade's tear"
Colonel Edward Lyon Bailey
and the Second New Hampshire Infantry at Gettysburg
Karlton D. Smith
"During this time, "a shell struck and burst on the cartridge box of Corporal Thomas Bignall, of Company C. The cartridges were driven into his body and fired, and for nearly half a minute the devilish 'musket shells' issued at Washington were exploding in his quivering form. But death was mercifully quick." A fragment of shell also burst the cartridge box of Sergeant James M. House, Company I, and the "rapidity with which he tore off the infernal machine hanging by his side was astonishing ...""