Well the obvious solution to your decision is "what you would use it for." But I find that decision a little harder myself. I would like a good all around gun that is handy and still effective at long range, but it's pretty hard to find something that fits both those categories. For now I just have to diversify my firearms on their intended use. For example, if I'm in the thick I would use my old Marlin 30-30 with iron sights, and if I'm on the deer stand in a big cut over I will use my Browning A-Bolt .270 with the S&B Klassic that has a 15 power zoom. But trying to keep to the 1000 lbs. rule the 30-30 barely breaks that rule at 200 yards and the .270 at 500 yards. Seems like on the chart a 18inch barrel .308 effective range keeping to the 1000lbs rule is 600 yards. So I would really consider how far out you want to shoot and how much energy you are trying to retain when making your decision.Very interesting! I read his 308 and 300 Win mag articles. Very cool!
I have a Ruger American standard in 308 and have considered going to 18”. But haven’t convinced myself to do it.