Black powder vs smokeless high powered propellents used for modern guns like the 16"/55's has a different pressure signature...very different. I know from experience with 4,000 lbs. of TNT detonated 1/2 mile from where I was standing- on the other side of a grove of trees-- the shock wave went through my body and staggered me like nothing I've ever felt before. Shock waves do damage at pretty good ranges. Even low powered black power, under pressure, even in half pound to a pound will move a body at close range. I tried never to die in front of Civil War era artillery, even at fifty feet my carcus was bounced pretty good on the ground. I usually balled up, covered my ears and opened my mouth to lessen the effects of the pressure.