I would have thought the realistic range of a 16" 7mm-08 has very little to do with the actual cartridge and barrel length and instead is entirely dependent on the shooter. How much practice and verification of elevation and wind drift they have done, and their ability to dial (or not) a scope.
Some people shouldn't shoot past 100m, some are good to 300m, etc. etc. I've met the odd person that probably shouldn't shoot past 17" with a 16" barrel.
Know your gear and ability first and foremost. The projectile will kill way out there.
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