Never in a million years ... it's better than throwing a fry pan, but just barely ... not sure what derringer you own that's so light ... I bought a Bond Cowboy Defender in 9mm because I thought they looked cool and really wanted one. They're hard to shoot, amazingly inaccurate, have to be cocked twice against a very heavy spring, reloading takes forever unless you practice constantly -- and you have only TWO rounds to use. I sold mine fast. For less weight, I pocket carry a Kahr PM-9 -- 7 rounds of 9mm, a quick reload with a magazine, not fumbling with loose rounds, and far more accurate and easy to use. Derringers are fun to look at and maybe to shoot occasionally, but I would NEVER bet my life on one. Hope you don't either.