dug this thread up from a google search, after a recent derringer purchase of my own.
I recently purchased a Cobra Derringer in .32acp. I purchased it as a curiosity piece because i already have several .32acp weapons. I paid $140. here is my brief review.
Accuracy: It will hit a pop can out to 6 yards with regularity, but even a single yard beyond that, and the bullets magically disappear. Probably due to the unregulated 2" smooth bore barrels....
Weight:: While it is very small, it weighs just as much as my KelTec P-32... and the P32 holds eight rounds, compared to the derringers two.
Recoil:: you may think the recoil would be the same as other 32 pocket guns, with its weight being comparable. The reality is that while the total amount of recoil energy may be the same, the amount that you actually feel is much greater. its compact size and poor grip design conspire to concentrate that force on a much smaller area of your hand. While the recoil of the 32 derringer isn't BAD, its enough to make the gun shift even in a tight grip, and if you hold it wrong it will sting your hand slightly. I think the 32 or the 22 magnum would be the practical limit for this type of sub-compact derringer. Something like a Bond arms with its greater size, weight, and ample grip would be able to handle something more potent.
conclusions: I think that its an impractical shooting gun. But as a backup gun or a stash gun it would be fine.