I'd agree with the others saying you already have a rifle and already have a scope. I say put them together and see how you like them. If it shoots well you're done. No worries on the 308 it's more than plenty. Get to it quickly though so if you're not happy with it you've got time to spin something up.
Having said all that, sometimes it's just fun to buy a new rifle and there's nothing wrong with that. Keep in mind what you said though about being archery hunters, this rifle may not see much use.
Having said all that, sometimes it's just fun to buy a new rifle and there's nothing wrong with that. Keep in mind what you said though about being archery hunters, this rifle may not see much use.