For some reason I cannot find a 22 MAGNUM factory round to fire completely in my new Single Six (6 1/2 SS). I've tried the common factory rounds of Winchester, Remington and Federal. For some reason the powder is not completely burning away. With the tiny unburned powder balls it jams the ejector rod making it hard to remove the expent round. Anybody have any suggestions. I prefer a magnum round for groundhog, but have to use the LR. Actually, the Winchester LR ammo is very accurate and fires clean with no problems.