Spud06 - no worries at all, I was really interested in Marius experience as well. With the quality and effectiveness of mono-metals, its a new game and that's why I'm curious about the 250 grain as an all around africa bullet (not elephant). Old rules don't necessarily apply.
I've used the JJhack 168 grain TTSX in my 30-06 and its been amazingly effective.
Personally, I would not go heavier than the 168gr in the 30-06. Turns the cartridge into a different beast with those 168's.