I'd look for a SS Remington 700 S/A .308 bolt, or purchase a Remington Ultimate Muzzleloader on sale and use its action and maybe even the stock. I'd send the rifle or action off to one of the many builders, such as: LR Customs, ASG, Bestill Creations, or Hanken's custom. My most likely choice would be the proven .45cal Brux 1:20 barrel, maybe the 1:18 twist, or if I so chose to go 40cal. a Rock Creek. Again, it would most likely be the .45cal Brux. The rifle would end up with the ASG Gen2 breech plug and modules, along with LR Customs T-Rex muzzle brake. I'd have my current 15moa mount, rings and Nightforce NXS system atop it. In my case, I'd use my current McMillan Game Warden stock. When the rifle was completed by any of the builders, it would be bedded, trued, top quality built, a 2 in1 rifle and as accurate as most can shoot a CF.
These rifles are not cheap, but they're no where near $8K, even with the top glass on top them. For $8k, I'd own two customs, one a .45 and the other a .401 and still have enough money for the best glass available to top them with. These rifles are ….. capable …. of shooting either smokeless propellant, or BH209. BH209 velocities of 2,400fps using 300gr bullets.
Here's an example of the long range accuracy of a custom built rifle, which happens to be a .40 shooting smokeless:
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If my hunting required at minimum a .50cal bullet, then the choice would be either the RUM or BP Xpress. I'd have the ASG Gen2 breech plug installed and shoot BH209 and Fury bullets at over 2,300fps.
Even the Ultimate Firearms Inc., BP Xpress, which is what I currently shoot. Again, install the ASG Gen2 breech plug and shoot BH209 and 300gr bullets in a sabot, at 2,400fps. A very accurate rifle, which I've shot 5 shot groups at 400yds of 1.5" and a 3 shot group at 500yds, witness and signed, of 1.873". But that's me.
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Not attempting to say in any way that the Gunwerk rifle isn't a good rifle and/or capable of long range. What I am saying is, for me, I wouldn't go that route and would go with one of the custom builders.