yes ray, aint that the truth.
getting enough shots of a similar nature into enough head of game with different bullets for meaningful statistical comparison is a lot of time and work.
it is an easy trap to go for too much bullet as much as too little.
we always look for something better, but it never hurts to remember the gold standard by which a cartridge made its name, at least as a starting point, and use that as a control in a comparison.
in the case of the 416 calibre it is a 400 gn bullet at about 2400 fps, and one that expands fast and yet holds together well is an obvious choice.
anything that beats the performance of that is an improvement, but maybe nothing will for a statistically valid number of kills.
bruce.