I have a stevens model 62 22 lr aka savage model 64 and this rifle was once a tackdriver but it seemed as if all of the sudden it started shooting very badly it went from about 1 inch groups at 50 yards or better to about 6 inch groups at 50 yards this rifle has fired about 50,000 rounds since i have owned it I tried cleaning it checking the scope for tightness nothing improved accuracy called a gunsmith he said it is unlikley that the rifling is worn out and I fired a round into some water jugs and found the bullet it had even rifling grooves all the way around it. the way it groups it very odd and seems to be consistant 1st shot 6 inches high 1 inch left 2nd shot is next to that then 3rd shot moves down level with the bullseye but remains 1 inch left after that they bullseye just fine for the remaing 7 rounds very weird i thought. any help would be much apprechated I shoot on all my days off from work but it is no fun to shoot a poorly accurate rifle and centerfire is to darn expensive and the sights on my 10/22 are awfully hard to use please help.