Granted I havent shot any of those rifles, but here are my thoughts:
The BAR has no iron sights. Im not sure I would want to have a ranch rifle that could only be used with a scope.
The Mini-30 would be a good rifle--it cheaper and is supposed to have pretty good reliability--but it isnt the most accurate rifle. Not a problem if you are shooting at a coyote 100 yards away, but something to think about. And like SuperMidget said, its not .308--but .308 is a pretty large round anyways--where are you, and what are you expecting to shoot at? I usually hear of people going with something like a .223 for a ranch rifle...
I dont know anything about the Springfield. Id hope its a good rifle for that cost.
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