Wow @300rum $40k is a big outlay. I guess the definition of "accuracy" & expectations can vary. I'm a hunter so anything around or under 0.5 Moa is my standard. Have done 5 custom builds mostly on R.E.M 700 actions and one Sako75.
All have met the 0.5 Moa or better. Also own 2 other custom builds which I bought as 2nd hand rifles. One wsm which is 0.3 Moa and one 284 which runs in between 0.5 & 0.7 Moa. The 284 is not a full on custom build- just a 7mm08 rechambered to 284. But at 5&1/2 lb it's my fav bush gun & gives me legs out to 700 yds