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To be pedantic, the first long range smokeless caliber that was good for 1000 yards was the 6.5 x 55 Swedish designed in 1891. It is still relatively common on long range shooters lists. The 6.5 bullet has better long range ballistics at longer ranges with lighter bullet weights than 30 caliber and 270 but at lower down range energy. 6.5 creedmoor is not quite in its class but does deliver the same bullet in a pretty good ballistic package.
Your post is a great example of thinking of what you're going to do at 1000 with the rifle. If you're hunting the 270 makes great sense but a small bullet selection. If you were target the 6.5 would be better but there are a number of 6.5s that are superior to the creedmoor like 260, 260 AI, 6.5x55.
In any event I like your research.
Thanks, agreed the bullet selection is limited, 152gr nosler ballistic tips and 152gr nosler accubond LR are basically going to be the only bullets I use.
Nosler also makes the accubond in 30cal and in 6.5 I believe, when I was comparing the "heavy for caliber loadings" that each had the best BC for each round to calculate my data for comparisons I saw that the 'old .270' wasn't a chump. I haven't begun to try and load for it yet, but on charts it looks respectable. Time will tell if charts and reality match up. Plus it gave me a reason to get a $300 bolt gun OTD.