It may seem like a lot of trouble but it will help your technique if you keep a running log as you shoot. Say you have 5 shots in the rifle. Take a shot following proper technique as well as you can. Where did each shot hit in relation to the bullseye? If it didn't hit the bullseye, take a moment and try to figure out why it didn't hit the bullseye. Write down any ideas as to why the bullet did not go where you wanted it to go.
After a few hundred to a thousand times the whole process will be so ingrained that your groups will shrink probably shrink from inches at 50 yards to centimeters at 100.
Also try and figure out what the weight of pull is on the trigger of your rifle. A lighter one than the one that came on it will probably bring down the size of your groups.