[Jeff Higgins]

The only gun I "shoot" one handed is done in the privacy of my own home, when the wife has been gone too long on a trip...

Seriously, other than competetive events where it is required, there is little reason to shoot one handed. It is fun, and challenging, and all of that, but really not very effective.

Ever hear the old "cowboy credo"? Never walk when you can ride. Never ride when you can stand. Never stand when you can sit. Never sit when you can lay down. Shooting a handgun is much the same. Never shoot with one hand when you can use two. Never shoot standing if you can sit. Never shoot offhand (standing or sitting) if there is a rest. Essentially, you want every available advantage in holding the gun steady. Unless it's a sanctioned competition, there is no such thing as "cheating" when it comes to shooting. Do what you need to do to hit.