Oozaru's power comparable to a battleship's main gun?

[SunWukong1986]

I was basically doing a research of my own when it comes to strengths and weaknesses of a Saiyan, until I read somewhere that it says about Goku during the beginning of the series as a giant monkey. I looked it up from the internet and it described his physical strength as an Oozaru during the Pilaf Saga in Daizenshuu "merely compared to the output of a battleship's main gun turret". How many tons of TNT does it deliver with that kind of force when it comes to Attack Potency? I know that he can physically wreck Pilaf's castle as he grew out of prison, but I do wonder how strong is a battleship's main gun turret to compare that with Goku as an Oozaru.