Perhaps I was unclear. Using the phrase "Saturation Fire" to describe a gun that is "just" large enough to damage two sections at once isn't really saturation fire. That's just using big bullets for big booms. Saturation fire by all meanings of the word should be putting enough shells into space that you know you'll hit something. You saturate the target with shells, hence the name.
We might just be speaking past each other, but in order to saturate a target, you'd need to fire a lot more than a few large-ish shells at it.