I shoot with a mates Hammer Shotgun after Geese
so just pull back both hammers.

I would do the same with a Double Rifle.

You never know when you will need a quick 2nd shot.

If it's happens to double itself, well, that's just
the same as a hammerless Double Rifle doing the same
so I would get it looked at by a gunsmith to make sure it didn't do it again.

Anyway, just my HO, others may have a different opinion.