i had the TC Venture in 25-06 and 115gr Nosler BT and IMR4350 (i think). i shot 3 or 4 deer with it, got bored and sold it. 25-06 does what the 270 Winchester does, kills deer. in my mind, the 25-06 is right on the line for overbore. i think that the 257 Roberts is about right, for me. i hunt in close cover, 60ish yards and less is good for me.