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The "I want to be able to load a naval gun of 6-8 inch caliber by hand" thing seems really stupid and random but it's not. In the age of big guns the "one guy loads it" caliber for a given navy was somewhere between 5.5 and 7 inches (140-178 mm). The strongest guys could carry a 7-inch shell.
The square-cube law is cruel. I tried to lift a 10-inch shell once. It did not go well.
>at battleship uss north carolina museum
>in the magazine
>exhibit has three different big projectiles with dummy propellant bags for scale - a 42 pound cannonball, a 10-inch shell and a 16-inch shell
>lol, i'm going to try to pick up the 10-inch shell
>grab the 10 inch shell
>wasn't even glued or welded down or anything
>retard strength gives out about a tenth of a second after it clears the shelf it was on
>drop it
>LOUDEST SINGLE "CLANG" I HAVE EVER HEARD IN MY LIFE
>start running
>chain between poles, which i snuck under the first time, stops me this time
>face plant into 25 pounds of sts floor steel
>get back up and fucking run aimlessly
>come to my senses in the egg storage area
>look it up on navweaps later
>it was a 510 pound armor piercing shell
>mfw
I was 110 pounds and didn't exercise regularly at the time. I tried to drop squat the equivalent of 10pl8.