Re: how do u tell scope no good
If the scope came loose that means you have lost your zero, time to re-zero it back .
Tighten everything back up and loctite the critical screws etc. buy the ammo you want to zero in and go to the range and shoot at paer targets to zero the rifle in.
Time to invest in a bore sighter, saves you time and money, i have both the expensive traditional one and the laser type sold at Wally world for $40+ very good to have , if not many gun stores have bore sighters and will do it for you for free, especially if you are a regular.
No easy way around it, you need to spend time at the range to get it back sighted in . (assuming you know the fundamentals of using a scope)