i'd make very sure that all metal and powder fouling are out of the bore. when you look at the muzzle you need to see that the rifling is not filled in/rounded out. it can be somewhat difficult to tell on some rifles; but the metal and powder will fill in the rifling and you have to look at the muzzle from different angles to verify that it is not clogged with 'crap'.
i clean mine 'til the rifling is visible with a 4x magnifying glass. i use various cleaners and LOTS of bronze bore brushing to get the barrel clean. make sure the firing pin can properly be 'pushed' through its opening in the bolt.
make sure the muzzle crown is not damaged. make sure nothing is loose. base(s), rings, stock screws, etc. spray the trigger group generously with the stock removed from the rifle to clean and lubricate the trigger and related parts.
since that 1989 target was shot, you have aged by 19 years. or nearly so. are you more sensitive to recoil now? hold that rifle tightlly, like a brand new bride, and it'll help absorb recoil. a loosely held rifle lets the recoil give the gun ''a run'' at you. it's hard on the scope, rings, base(s), and your shoulder.
lastly, don't give up. it'll probably shoot if you persist.
take care,
ss'
