Kind of long post. Lol.
Wby vanguard deluxe 338win. When I got the rifle 6 years ago. Did load development with 230eldx hybrid 100v. Shot well under 1moa. Loaded up bunch. Fast forward to 3 years ago. Took it apart to clean. Found the stock had cracked. For recoil lug back to cross bolt. After searching for a year for a correct replacement no luck. (Barrel channel list as #2 but that fat 338 is more like a #3.) So I picked up a deluxe stock and sanded it out to fit. In doing so I ended up floating it. Shot like crap. Stripped and rebedded action. Fits like glove. Shoots like crap 3moa. Added pressure to Barrel 3 businesses cards thick shoots like crap. Sanded back out. Started seating depth test. All of the rounds I had loaded previously were 10k off lands. Cleaned barrel then did 3 Shot depth changes 15, 20, 20, 25 all the way to book spec Shot horrible shoot consistent bad 2moa at best. Changed powder to 7828ssc did a quick 2 Shot load development at 20k off lands 2moa+. Picked up a box of 180 accubonds Did load development with h4350 20k off lands. Shot bad but not as bad. Took the best group. Did seating depth test. 5k- book speck. Got one group that looked promising. Could not get it to repeat. Same lots of powder same sleeve of primers 215 same old stock r&p brass. Changed brass to new win and primers to cci250. No change.
I have taken rifle apart inspected everything. Re torque action. Pulled scope re torque rail screws picked up new vx3 3.5-10x50 scope mounted tq rings to spec. Even pulled the new scope put it on a different rifle and it works as it should. I'm at end of my rope help. I did notice there was a tight spot when I was checking float. Pulled stock found it'd the swivel stud. Could it be hitting and screwing up the harmonics? Don't see any marks on barrel. Time to rebarrel????