Mine is a .243...
Some authority there but the bullets are smaller, don't cost a lot. Powder and primer expense about the same as the .308, though.
As long as I stay away from light bullets going fast, the barrel should last OK. That's no problem as the gun seems to like 70 grain bullets best of all, and doesn't do nearly as well with the 58 grain stuff.
No real kick to speak of from a ten pound gun, just a nudge to let you know that all went well when you touch it off.