Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

Here is a guy demonstrating the Colt Cobra- at very close range. You can see the muzzle flash and the smoke- which we don't see with Ruby. And you see the kick that it has, and then you hear him comment that it has a lot of kick. Well, the famous photo by Bob Jackson was taken a tiny split-second after Ruby pulled the trigger. Yet, it looks like he hasn't fired yet. We don't really get any sense at all that he just discharged the weapon. Keep that in mind as you watch this guy doing it. And notice that he used two hands. Ruby, apparently, fired with just one hand, which means that the recoil would have been greater. 

 https://www.youtube.com/watch?v=KpVKtRLckI8