It would depend on the gun. A revolver would let all the pressure from a charge that small out through the barrel/cylinder gap before it moved the bullet. But in theory, if it is a single bullet, it should be possible to do. I would try more like 2 grains in a big bore, but it should go. The thing you need to be careful of is that only one bullet got stuck. If there is more than one in the tube, you need to knock it out. I keep a small hammer with screwdrivers in its handle in my pistol box. A hammer and a brass rod would take care of the problem too.