Idaho Shooter: UPDATE!
Those 2,240 pound projectiles were the "original" intended shells!
Those were replaced with projectiles that weighed 2,700 pounds (two thousand seven hundred pounds!) each!
Those projectiles flew for 23 miles.
Then in a less clear reference Wikipedia gave muzzle velocities thusly:

AP = 2,300 F.P.S.
HC = 2,635 F.P.S.

I am guessing the "AP" above is in reference to an "armor piercing" projectile?
I don't know what the "HC" refers to.
Hold into the wind
VarmintGuy