Aghhhhhhhhh! Another lurker! Common HuntnID, get naked and get in the deep end of the pool. Seriously - welcome to LRH.
Another thing to check on (after making sure all carbon & copper are removed from the barrel) would be the screws on your base and rings. If not properly tightened, repeated pounding with each shot during break-in might have loosened something up without you noticing. Probably not the case, but don't take it for granted.
good point, it happened to me today for the first time after about 10 shots. My scope slid forward in the rings, even though I thought they were plenty tight. This was a new mount, so I'll have to get a real torque wrench on there, and some blue loctite between the base & action, and the rings & scope.
by the way, no ordinary medium caliber gun, its a 35 whelen, shooting 225 gr nosler's at 2760fps...
loaders_loft, when you say some blue loctite between the base & action, and the rings & scope. do you mean just that...loctite goes between action and base and then are you putting a dab on the inside of the ring. If so how do you get it apart if you want to changes the base or rings or scope?
Clean the scope-mount holes in your rifle's action- as well as the mount screws with acetone, MEK or alcohol to degrease them. Then, take a toothpick, add some blue loctite to it and apply the loctite from the toothpick to the action hole threads. Now add one drop of blue loctite to each of the mount screws and wipe away the excess. One you have done this, attach the mounts to the action and tighten the mounts. The loctite takes about an hour to become gummy and prevent the mount screws from vibrating loose. Do not add loctite to the scope ring screws - not neede.