Congratulations on the new rifle your dad is going to love it. Weatherby ammo can be pricey but they are now selling a 100 gr round for about $40 a box. I bought a couple boxes because I wanted the brass. It is actually very accurate ammo but the lower BC of the bullet and the slower muzzle velocity of 3500 vs 3600 causes it to not deliver the long range performance that you would expect from a 257 wby. That being said it would be a good choice for breaking in the new gun and deer hunting at moderate range. I did shoot 1 whitetail with it at about 150 yards and it piled up on impact. All of the options mentioned already will perform wonderfully in your Dads new gun.