I Keep hearing hear that "moon clips may make you dump live rounds", but that is also true of speed loaders. First of all even without clips it is hard to quickly dump the spend rounds and keep the live ones in their chambers, next how are you going to insert any of the rounds in a speed loader when several of the chambers are still full. Your NOT. Even if you did manage to keep your live rounds chambered and you got X number from the speed loader into the empty chambers what will happens with the left overs in the speed loader?? More important, just how long are you willing to fumble around trying to save a couple rounds in the middle of a gun fight when what you need is a full gun in a hurry? I would rather loose a couple rounds and have a full gun in a hurry. IF it boils down to the last 2 round you dumped, you never really had enough ammo anyway.
But, for my 325 45acps I carry 2 round and 3 round clips for my reloads anyway. If wanted to run clips in one of my 32 H&R J frames I would have some one cut some from spring steel with a water jet or laser. You could get 2 or 3 rounders made, just smaller than those for a 45 acp. Might as well, because most people have to spend cash to get the cylinder cut for clips anyway.