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COL BEAUSABRE
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Comments by "COL BEAUSABRE" (@colbeausabre8842) on "USS Massachusetts - We've found a bigger boat!" video.
The 16 inch projectile remnant was recovered from Jean Bart's secondary battery magazine. Fortunately, the magazine was empty or she might have gone down in history with HMS Hood when the anchor came down on L'Arc de Triomph.
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The 16 inch Mark 5 with without its AP cap https://en.wikipedia.org/wiki/Armour-piercing,_capped,_ballistic_capped_shell#:~:text=The%20primary%20job%20of%20an%20armour-piercing%20cap%20%28AP,top%20of%20the%20projectile%20lying%20against%20the%20tip. "The AP Mark 5 was a major change to a hard-capped, sheath-hardened AP projectile that could penetrate caliber-thickness face-hardened armor at 30 to 40 degree obliquity (this was its test specification). It gained most of its extra weight by reducing the filler to only 1.5% of its total weight and by using a thicker, wider, high-hardness AP cap. These projectiles with a different fuze adapter and base fuze were issued to the U.S. Army Coast Defense Command as the AP Mark 12. These Mark 5 and Mark 12 projectiles had a very blunt - though still pointed - body nose under the AP cap to improve their high-obliquity penetration of medium-thickness homogeneous deck and turret roof armor. The AP Mark 5 projectiles were designed to be used in long-range gun actions against Japanese ships ("Plan Orange") and for that reason they were to be fired at relatively low muzzle velocities and high gun elevations. These conditions would result in a steeper angle of fall in order to enhance their deck armor penetration capabilities." - Navweaps
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