OS OK, like I said, I do not believe you are the problem. You have a gun/ammo issue but you need to convince yourself....
If the gun shoots poorly off the bags, and I expect it will, the only thing left to do is put a known good scope on it and see if the cause is how you use iron sights.
Once you reach the stage of adding the scope, if groups are still poor, try a few different brands of ammunition. If none perform, the rifle is suspect. Some guns will not shoot....I had a .22 Hornet like that. After a month of drinking around I sold it.
Good luck!