1600fps may be the minimum for some expansion but 1800fps is in my opinion a more realistic minimum to actually deliver some shock to the animal and ensure some expansion and a quick kill.
Having shot some fairly long range animals with 308 and 168amax launched at 2750fps and not all of them good shots Id say you are asking quite a lot from a 16inch barrel.
Windage is your biggest enemy with long range and 308 and the ability to accurately place that shot as it takes piss all to push you 6 or 10 inches off at 600y.
If you practice heaps and have the skills tho all power to you.
2206h is better suited to lighter weight class bullets in 308, 2208 or maybe cfe223 should go better in the heavier class bullets.
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