I have a handirifle in .223. Fun gun. I want to get an extra barrel. Here are my choices:
.22 hornet, .243, .270, 7mm-.08, .280, .308 and 30-06. There is a chance a 25-06 barrel might fit also. Here are my exisiting guns, two bolt actions (.308 and 30-06) plus one semi auto 12 gauge, two semi auto .22 LRs, and one .54 cal muzzleloader:

Where I live the shots are fairly short, 100 yards is a LONG shot. I mostly hunt deer with some turkey hunting also. I am leaning toward .243, .270 or 7mm-08 for the extra barrel. .270 is probably my # choice right now.

Tell me which you would get and why. Thanks!