Were you "grouping" with the 20% of shots you were on target with?
If they were all catching just one corner of the target, you need to adjust the scope using its adjustment knobs.
If your target hits were randomly scattered across a 8X10 target.....its probably the shooter; possibly the rings/scope/rifle.
Are you shooting from a rest?
If you want, send me a PM, I can talk you through adjusting your scope and checking your scope and mount.
Maintaining a constant state of cat-like readiness and a heightened state of suspicious alertness.