Can the lack of air chamber/ piston lube lead to accuracy problems in springers? I have air Ruger Air Hawk .177, that one minute is dead-on, hole on hole at 20 yards, the next minute 3 inches off. She hits really hard, not supersonic, but will easily penetrate 1/2 wood with wadcutter pellets at 20 yards.Have changed scopes, tightened all screws with loctitie and added a de-resonator . Using Meisterkugln and H&N Barracuda Hunter extreme pellets. Barrel is clean, what's up? Please advise...thanks.