Maybe my comment isn't worth a lot to you since I don't have experience with those particular rifles, but it seems like all are pretty expensive for what you are getting. Note: if he's planning on selling in the future or is in love with some of the features, maybe it makes sense. Many guns now have accuracy warranties including those half or 1/3 the price.
Maybe he's not willing to include any other guns. I wonder if the approach was to choose the cartridge which limits the possible options. If the approach was the opposite, the list could be much longer. I'd personally spend more money on the optics and less on the rifle, but maybe money isn't an issue. Also, I'd consider a folding stock like a MDT HNT26.
From what I've heard/read, the thinner barrels like the Mountain Ascent don't allow much practice time without a lot of time to cool off in between. That may or may not be an issue.
One thought about the caliber choice, I understand the reloading, but what happens if the ammo is left home or otherwise lost? A more popular cartridge with similar performance might be a better choice. A 7mm Remington Magnum has similar performance even though it uses a bit more powder, for example.
Have fun shopping.