Gunner, you will do fine w/that 243. OK has some open spaces so if you plan to shoot really far, you might check expansion at long ranges to know where the limits are for expansion.
You should be very good to go to +/- 350 to 400 yds. Any further I might lean to the 95 BT as its softer nose w/tapered jacket may open at lower speeds better. Just a thought, but sure you will flatten anything you properly aim at w/those loads.
