While hunting, you want every item you might need for loading your gun as accessible as possible. Immediate accessibility is not as necessary when you're at the firing line as it is in the woods. Also, the gun you choose for the range may not be the best gun for field use. For example, while a Pennsylvania Rifle with a 40 inch long barrel might look great and shoot well when banging away at a target at the local rifle range, that same rifle might be just too long and unwieldy for use in dense cover. After all, if you will be turning in the bush with your gun at your shoulder, a 32 inch barrel is a lot less likely to bang into something then a 40 inch barrel is.
Caliber is also something to consider.
When headed into the field to do some hunting, you want to be sure that the caliber of your rifle is both legal for taking your prey in your area, and appropriate for the game you intend to shoot. Remember, while it's true that a perfectly placed shot can kill a deer cleanly, even if the rifle is a .40 caliber, perfectly placed shots are not as common in the woods as they are at the range. You will be presented with obstructions between you and your prey. You will be moving in a very deliberate manner, and your target might well move just as you are about to pull the trigger. We call it buck fever.