Not very common...as you say "used for dueling and target shooting"
the short range on average , cost and pack-ability would prelude them in most men's possibles, that not to say never just not common at all.
Now, a marshal pistol would have value as a quick 2nd shot close in , but I imagine few were available to average trapper/ M'man
though one might see one at Popo agie or Green River.