For those of you who shoot the 7mm Rem Mag, what do you find is the best bullet to use for hunting mule deer and/or elk? Is 150 grain big enough for elk or should I use 165 grain? If I use 165 grain, is that too big for mule deer? I guess what I am asking is, what would be a good all-around bullet I could use for both elk and deer or would I be better off using different bullets for each?