Mike,
I compared a 56 to a 40 because that was what he asked about.
What I'm trying to decide is if I really need to replace all the .40 2c power with identical 4c power (.70 4c)
No, I do not think a 56 is comparable to a 46 like the OS FX, or even the TT 46 Pro. But I think a 70 four stroke produces a bit more pulling power than one of those 46's.
And you're right taurus, it is all opinions, but it's mine that are right.
Dennis-