Haven't ran across this question. But sounds like it would be a good debate. Barrel length. Short or long barrel. This is for eather rifle or pistol using factory ammo. Why did you chose one or the other?? Or does it matter to you? Concelment for a hand gun. 410 derringer barrel is 1/4 longer then the 410 shell. I'll shoot anything once, this one I would have to think about.