I put together a CZ455 trainer with an OEM barrel and receiver assembly,Timney trigger and a Manners stock. I have tried Norma Tac22,Wolf Match Target,Eley Tenx and a few others and I have a hard time getting it to shoot better than 1.5 to 1.75 inches at 100 yards. Any thoughts or ideas? What are you seeing out of your same type set up?