It's a projectile at the USS Texas display at the Lone Star Flight Museum in Houston, near NASA. The bore is 14"45 caliber; the projectile weight is around 1400 pounds and the maximum powder charge was 425 pounds.
There's a good video of the 16" gun propellant from the New Jersey on YouTube at https://www.youtube.com/watch?v=-2oDJDgEGGU.