Hey everyone. Two years ago I got a CVA Optima. I zeroed it a little high at 50 yards, shooting 100 grains of powderdex pellets and a 245 gr. powerbelt bullet. It was groupingpretty good. This year I decided I wanted to zero it at 100 yards. I shot it and can not get it to group good at all. Then I decided maybe I should move up to 150 gr. of pellets. It still didn't group good. Any advice would be much appreciated (I AM SIGHTING A SCOPE)