Da'gum. I never really thought about that. It was just easier to notice with the Encore barrels because it's all right there in front of me. Don't have to look down the receiver of a bolt action and measure all that. Thanks bigbulls.

After some research on this subject, I have found a couple of articles that suggest using a slug barrel between 18-21 inches in length. They state that modern powders are burned by then, the rifling has imparted spin on the sabot and any additional length/rifling will slow down the sabot from resistance.

Guess I'm just stuck with my 28" 20ga barrel. I also have a 24" 12ga barrel but that thing kicks like a mule.