Does this mean you have an unlimited amount to spend, or you haven’t really thought about how much you want to spend? It would be helpful to narrow it down a bit. As it is, you’ll get replies from buy a Ruger American, Arken scope, and Harris bipod to a custom action, Bartlein barrel, ZCO scope, and Clykyod bipod; thousands of dollars worth of difference there. It’s hard to know which direction to send you.
Based on the limited information and considering a 600 yard range, if you want a production gun, I would look at a Tikka CTR, about $1200, and a Athlon Ares ETR 3-18 with MIL reticle for about $583 from EuroOptic.
Tikka T3x CTR 6.5 Creedmoor Rifle JRTXC382CA | Only at EuroOptic.com!
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FREE SHIPPING on Athlon Ares ETR 3-18x50mm APRS6 FFP IR MIL Riflescope 212106
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If you want a custom action, look at the Bighorn Origin, a barrel from PVA, a KRG-B stock, and a Athlon Gen II Cronus BTR scope as a minimum.
Good luck with your choice.