The number one misconception is, that double rifle are regulated to cross at a given distance!

They aren't!

The number two misconception is, that because of the barrels are regulated to cross, the rifle is not accurate at long range.

This opinion is fostered by the misconception the rifle is regulated to cross in the first place.
It is as accurate as any iron sighted rifle at any range. if useing a proper load.

The third misconceoption is, that the O/U is eaiser, or even that it is unecessary to regulate it at all, than a S/S.

The O/U is actualluy harder to regulate properly than a S/S.

The fourth misconception is, that experience with a shotgun give a person insight, and understanding, into the workings of a double rifle!

It doesn't!

I say most of the misconceptions in regard to double rifles, both O/U, and S/S, have been offered in this thread, as fact! and 90 % of the opinions expressed here are patently wrong!