I have cleaned the barrel and it is not pitted or anything. The sites are tight and the action screws are also tight.

Before I could shot groups between 1/2 and 3/4 inches at 75 yards now I am lucky to get a three inch group at 50 yards. I have considered that I could have started a bad habit but I have no trouble with any other rifle.

I may have got the model wrong my rifle is bolt action.

It kinda happened suddenly not a gradual change, if that would give any ideas.