To what end are you wanting to soup up the old .35 Rem? If the 200 RN at about 2000 fps will not kill what you're wanting to hunt then you really need another rifle. It works fine on deer, black bear, moose, elk, etc. The idea of trying to make it a long range gun is a bit asinine in my opinion. Just not enough case capacity and too much bullet diameter to make it a hot rod long range gun.
Use it within it's design parameters and it's a great round.