Tis why I’m now a spectator and not a participant in the conversation anymore.
We are past the point of any data given being of any confidence.
I'm starting to understand why half of this forum is frustrated with this thread.
You have already been given suggestions to assist in quickly isolating your issue if it is in fact a hardware issue.
You have not alluded to attempting any of the resolutions suggested.
Regardless of what ammo you are shooting, .338LM is expensive to shoot yet you continue to throw money downrange w/o specific control changes to your hardware.
Have you swapped scopes out?
Have you checked any of the other suggested items?
If not, why would you continue to throw expensive ammo downrange without an actual plan to isolate and resolve?
Was your 0.6 MOA grouping one shot group or an average of several with that ammo?
A person could fire a bunch of groups with a lever action 45-70 and iron sights and statistically stumble into a 0.6 MOA group but that carries no weight in the capabilities of that rifle.
I understand that you are probably working during the week and don't have time to constantly update here. However since you started this thread looking for assistance, you are somewhat obligated to take action on some of the recommendations. Instead you are coming across as unorganized and running around like a squirrel with random attempts to have the rifle perform to your expectations.
Get with some type of program to systematically resolve your perceived performance problem (and share it here) or tap out of this thread please.
./