When I first carried a S&W Mod 25-2, as a Duty Gun, there were no full moon clips.
I carried half moon clips in a Dade Speed loader carrier. It would carry 8 half moon clips in the same space as two 44 Mag Speedloaders.
Later when full moon clips became avialable the dade carrier would carry four full moon clips.
This gave me twice the amount of ammo...
When I carried the Mod 25 in Plain Clothes, or Off Duty, I carried the clips in my right front pocket.