Huntaria,
Ooops, actually I have not tested this cross over business to any extent at all, and my guns do not cross at 100 or even 200 as I recall.. I just accepted they cross over at some point as it is proclaimed as fact from "those" in the know! :), at least they are supposed to be in the know! smile..

A test such as you suggest would be very interresting and shed light on but what could be just another one of those old wives tales, that have plagued the double rifle establishment for years...