Forget scopes with BDC reticules. Not only won't they work with other calibers than they are calibrated to, they often won't work correctly unless your load is exactly perfect to match the BDC reticule. This means that you will have to tailor a load to the BDC reticule rather than what your rifle shoots accurately.
Mil dots work, but add a lot of unneeded math into the equation.
I strongly suggest you get a scope that has an MOA reticule, as the adjustments you see on the reticule directly correspond to the adjustments on your turrets. No guesswork needed.
Agreed with all of this. Except do mrad instead of MOA.