Are there any indicators that a scope is in need of repair outside of shots being all over the place?
Okay...so it sounds like your shots are all over the place....
Eliminate all the other variables. Benchrest your rifle, check the rifle to mount/mount to rings/rings to scope interfaces, make sure you haven't change ammo types/brands...
If you have a grid type bore sighter you can look through it and if the POI changes as you dial up and down on the power ring it is hooped. I've had this happen to more than one scope that is made by a company that sounds like something-nell.
Have done all of these, but I am a new shooter, so was still putting blame on myself as I had caught myself doing some bad shots. But I've heard people blame the scope, so wanted to know how I could verify it wasnt the scope's fault.

I was out one day shooting at 300m and I was chasing the spotter over a 4x4 target face. Turns out I had only hand tightened the rings to the base when I changed scopes and it took me 7 or 8 shots to finally figure out what was going on.![]()
Turns out the base had worked it's way loose from the receiver




























