I am trying to decide on a rifle and cartridge that will not break the bank and will take any game in Texas/Oklahoma up to 600 yards. I'm also looking at this from a preparedness angle for what kind of ammo will be more likely to be available if it gets hard to find again. What are your thoughts? Will 3030 still be effective at that difference? I lean 308 for various reasons, but I'm also fond on 3006 and lever guns. TIA