If the scope shifted from some light butt taps that’s certainly an issue. I would suggest remounting the scope and what torque specs are you using? You can bed the rings also.
I would recommend testing the 205s at 72,72.5,73,73.5gr and at least 300 yards. See how they group after figuring your...
If you can chamber and unchamber a live round with no issues I wouldn’t suspect OAL or the lands to be an issue.
Do the fired cases have rub marks on them? If so at what location on the brass?
It could also be the loaded rounds are just to hot for your rifles chamber.
More than likely it will either fall off or get broken off before too long especially once he attempts to strip his velvet from the other antler.
Pretty interesting though. I assume he had a regular set of antlers last year?
Looks fine. Did you clean the inside of the bolt body and also the lug recess area of the action? Sometimes those can become very dirty with grease and gunk.
It was probably just that ammo but at least it’s all clean now also.
I’d pull the barreled action out of the stock. Scrub the barrel clean, disassemble the bolt and clean it and degrease the trigger and action while it’s out of the stock. Apply some light grease to the bolt locking lugs and reassemble it.
Go shoot it with some different ammo and don’t forget your...
Lots of good advice given above already.
What reloading dies are you using? Are you FL sizing? Neck sizing? Are you lubing necks while sizing? Prepping brass?
100ES is pretty high. Did you chronograph the other test loads? Were they all this high?
Sometimes just a little less or more powder or...