When it comes down to how much shooting you plan to do, all the costs involved in the actual hunt with license/travel/equip/etc. the cost of ammo is very insignificant. Even at $55/20 = $2.75 per shot unless you plan on shooting a truck load of deer isn't very much money. Consider also that if you are just talking about shooting deer and they aren't really big deer, just about any factory .270 Win ammo will handle the task with little trouble. I would use whatever shoots well in your gun.