Well, if you mean PvP, I can't think of a situation where I would not wish to unload the full clip on the face of my opponent.Have you tried High Capacity? At the very least it gives flexibility. There are situations where you don’t necessarily want two shots to come out. There are also situations where you want to control the interval between shots, which you can’t with Double Shot.
If you mean PvE...well, no big deal, it'd be fine with any kind of weapons TBH.