Well some updates for the good CGN folks who have been kind enough to follow along! Work has been busy, so apologies I don't post nearly as much as I should.
The rifle functions really well. I will note that it does in fact snap the extractor over an already chambered round, which was a concern someone had before. My Mauser Model B does the same, which is a nice feature.
I took the rifle hunting last November and was able to shoot a nice Whitetail Doe with some PPU factory ammo, as I wasn't done my load development. Zeroed it and it grouped fine, so I thought it was good for anything under 200 meters. She stepped out around 30. Shot in the upper chest, cut both lungs and nicked her spine (no tenderloin loss

), she did a backflip and died on the spot. Apologies for no picture with the rifle, it was too damn cold that day lol.
However, I did go out and go a seating depth test this past weekend as the weather was nice. 12 groups (some not pictured), with a couple promising ones. Those two I'll load up again and confirm results. As an aside, I bought a lead sled, which makes load development from the bench with this gun much more pleasurable. I don't put any weight in the sled, but just the added weight of the sled makes the recoil completely manageable. This rifle is fine in every other situation, but a long string of rounds from the bench isn't the most pleasant.
All loads are the same charge of BL-C(2) with a Hornady 286 Interlock, running out at about 2390 FPS. I have some 250 TSX's which I also want to try, but they are hard to find for me. What would really make me happy is some 250 Accubonds! My previous load development showed this was a strong node for the rifle at this powder charge. Based on my online reading of BL-C(2) charges, I started higher, but it was clearly evident that while it was pushing the 286's out at nearly 2600 FPS, the primers were not happy. The rifle was also just outright not fun to shoot at those higher charges, so this feels like a good place to be.
More to come, as this rifle will be out looking for spring bear this May.