RE: Your opinion on best .270 load for long range.
One that shoots best in you gun. You will have to try all factory loads. Each gun has their own mind what they like. Just like the rest of us. Each firearm may like one factory load better then another that is shooting the same cartiridge. My suggestion is to pick up a box of each and see how they group at 100yds. then at different ranges. Then also you may have to reload and taylor your own loads.