Have you ran your loads over a chronograph?
Not yet... I just picked up a magnetospeed and have been too busy to try out my loads. It does shoot to the identical spot as the Factory Weatherby (the 115 grain Nosler Ballistic Tips). If I'm shooting to factory Weatherby loads, I'm happy. I'm not sure if JJ-65 was serious but I don't think these are weak loads. In fact they are max in most (and over max in some) of my reloading manuals (5 different companies)... Check out the Nosler link... http://www.nosler.com/nosler-load-data/257-weatherby-magnum/