Standard tonnage for a Iowa class BB 45 thousand tons.
Mean (That means average, not the heaviest, not the lightest, but average.) load of a wartime Iowa class. 52,000 tons. Like I said before if you want to disprove it you have to make it fit all cats not just the heaviest. Also WW II BB's were equipped with fire control computers that factor in every movement of the ship as well as made adjustments to height roll and even accounted for bounce. No such weight restriction was put on these ships and they did indeed take on ballast but that was to counter roll due to high seas not standard operation.
Six 110 lbs charge bags went into the guns along with the projectile and bursting charge on the nose to total 3,405 lbs each. The breaches were closed and when fired, the entire mass came out the business end of the gun at the same speed of the projectile. In other words the charge is projected out the end of the gun contributing to the momementum put on the gun and its platform. No way is the charge behind the blast it is the blast.
The charge is in the gun.
Stern view of the BB 45 USS Colorado firing a 16 inch broadside:
Ben Blee spent the war on the USS North Carolina while the guy who wrote that article was in diapers. Please show me when the guy that wrote that article was present during a live fire exercise of a battleship broadside.