What would be the cause/causes of bullet tumbling? More specifically in a ruger single six revolver. Was at the gun club tonight and another shooter had a newer single six. Anywhere from 1-4 bullets out of 6tumbled and hit sideways. They tried multiple brands of ammo and even switched to the .22 mag cylinder, with no change. I happen to have the same gun and mine shoots excellant. Any ideas or opinions?

KEJ