Something aint ringing right here.
First off the cylinder should not go in the gun till you are on the firing point, so it should not be loaded on the gun as per conventional m/l revolver.
We have a similar situation with the Patriots magazine. It seems accepted that the magazine can be pre-loaded because it is the same having loaded cartridges, as long as it goes no where near the gun off the firing point.
In my local club there only one nitro conversion which is Taurus based and its owner fully loads 3 cylinders in the clubroom so that he can shoot a recognised discipline. Yes there is added danger because of the firing pins but they are set back from the face. It would take a crazy fluke to set it off same as it would a cartridge, nothings impossible but what can you do? To load on the firing line whilst against the clock is impractical.
Think about why we load cartridges primer first, if they are gonna go off its while being inserted not while putting in powder or bullet.
“If a cricketer, for instance, suddenly decided to go into a school and batter a lot of people to death with a cricket bat, which he could do very easily, I mean, are you going to ban cricket bats?” :- Prince Philip said after Dunblane