Recommendations? You always have good one's.
Given a $6k budget, I’d personally buy or build a bespoke rifle built by a custom smith, or drop in custom parts I can assemble myself. But are you wanting a turnkey/factory option?
Were it my money:
Action: Defiance Ruckus or Impact 737R
Barrel: Bartlein or Proof Research
Trigger: TriggerTech Diamond or Jewel HVR
Stock: Manners TCS or Foundation Genesis2, or if you’re into chassis’, then MPA Matrix or MDT ACC
Brake: Area419 Hellfire for Creed, Sidewinder for Magnums (and I’d get the creed) or APA Fat Bastard
All of this bolts together in a bit over an hour, and should run something around $3500-4000.
Or you can get very close to this performance with turnkey/standard offerings from GA Precision Pinnacle Production Rifle or MPA PMR, or Badrock Southfork. These actions, triggers, and stocks/chassis’ are a step down from the peak of the mountain mentioned above, but really don’t give up anything for performance. The GA and Badrock rifles are Defiance Tenacities instead of Ruckuses, and use a standard Manners stock (T2A instead of TCS) and TriggerTech Specials. The MPA PMR is a BA chassis instead of their Matrix, also with a TT Special in a Curtis Axiom action… and these come in at $2000-2500.
$6k could build a top level ELR rifle in the big Cheytac/Rogue cartridges, spanking any capability a Barrett MRAD ever dreamed of reaching.