We do understand.
But, there is also a search feature, and I've found a lot of good info, I would not have otherwise, by using it.
I would encourage you to use your 3f. Or, really, whatever you have more of.
I've found I prefer it. I don't have to carry around, or worry about running out of, more than one powder and 2f and 3f are not hydroscopic (but the burnt powder residue is so clean your pan) like 4f is.
The only real reason I can see to use 4f in the pan right now is to conserve main charge powder. But, that is only if one already has it.
With limited powder availability and rising prices, if I'm buying a pound of powder, I'm spending money on something I can use for both.