Still be a fair bit of recoil from a 284 Win putting a 160 grain out over 2900 fps though Gillie, don't you think?. Probably same recoil as 7mm Rem mag, especially with rifle around 10 lbs or less.
Maybe a 280 Rem / 7* 64 (both 7mm cals)wouldn't recoil so hard but still put out a 139 gn or 150 gn at 2900 plus with good BC and accuracy and capable of getting a 160 grain out there very quick if needed. Sure, it's a slightly heavier medium 30-06 length action, but a cartridge well proven and all components readily available. No issues with bullet lengths or mag fit. Still around 10lbs plus, weight though to prevent the shooter getting knocked around too much.
These cals, 7mm, 308 cal still like barrel lengths over 24 inch to go well at long range ay.
I agree with your alluding to the 600 metre range. Most shooting is well inside that and shooters who seriously believe they will competently, ethically and regularly shoot beyond 600metres and out to 1000 metres as a matter of course are investing in fairly heavy rifles and scopes and having to accept that they will always be toting a lot of weight unless they are very strong and can stand a lot of recoil punishment if they choose to use light rifles.
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