For easily available ammo, good killing power pretty hard to go past 7mm rem mag or 300 win mag. If he's only shooting the odd deer or tahr then surely he can live with the recoil (shoot a brake or live with the suppressor weight, no free lunches), plus having a little extra grunt will help if shot placement is a little off, if he's willing to hunt that way. Not my cup of tea.
I'd want the factory stuff shooting at least 1/2 MOA. 600 metres is a fairly tough shot if there's anymore than a light breeze.
Check out some of the long range hunting guys on youtube, you'll see the wind drift they're dealing with. Practice will never make perfect when dealing with wind![]()
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