Everyone wants the "perfect" load for deer AND elk. Doesn't exist there will always be a tradeoff. Too heavy a bullet will pass thru on deer. Too light will break apart on elk. There is a compromise, go somewhere in the middle to do it. There will still be tradeoffs but if you're careful you can nuetralize them with your skill as a shooter. The perfect bullet would be a handload in this situation, a 165gr partition would do the job just right for both outta the 06. If you don't want to handload my suggestion is use 2 bullets and learn how to shoot em both without re-sighting. Set your heavier bullet to 200 yds and then find the zero for your lighter bullet and then in the field just remeber your elk bullet is zeroed at 200yds and your deer bullet is 250yds or whatever it ends up being.