Re: Going to build a 243 or 260
Go buy your sone a Remington SPS youth, drop it into a Bell and Carlson Alaskan stock (as was on the Ti rifles), put a good scope on it, and let him loose.
If you are feeling particularly frisky, send it to a smith and punch it 243ai.
87 VMAX's for play, and 85 TSX for deer and antelopes.
The factory Remmy tubes are 1:9.125", and are generally capable of stabilizing the 105 AMAX's if longer ranger pursuits are what you are after.