Throwing in a couple of pennies. Been running Kelbly's Atlas 338 in 300 NM since early 2021. I also have three other atlas tacticals in various flavors. All of them great, smooth performers. Customer service is excellent. Highly recommended.
The one thing wonky about the Atlas 338 action is the bolt stop. It needs a T10 (Torx) to unscrew the bolt stop in order to take out the bolt. I made a little sling out of heat shrink tubing to attach a Torx key. Works ok, but looks goofy. It's the red tab in the attached picture. This is purely a range gun to shoot out to 2
000k (well used to be able to anyway).
MPA competiton chassis works great. Huber trigger works great with Kelbly's trigger hanger. Currently running four Hubers. Have tried Bix and Andy and Trigger Tech triggers. Will only be using Huber triggers from now on. They are all 2 stage, by the way.
I see MidWay has an Atlas 338 in stock for a decent price.
Kelbly Atlas 338 @ Midway
Good Luck
Edit: Haven't made it to 2000k, will stick to 2k (yds) for now.
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