never. not no when, not no how, had a desire to shoot a derringer
Neither .22, nor .45-70.
I could see it for an undercover cop in a real dangerous situation, but otherwise no.
Dad had a Baby Browning .25 for a while. When I was young, I asked him one day if we could shoot it at the range. He replied, no he was afraid of getting a finger in front of the muzzle.