I ran a 6 round stage like this at an IDPA match a while back that was advertised as 'revolver friendly'. It was after the major matches for the season, so we wanted to encourage people to shoot a different gun for fun. I simply stipulated that all ammo had to start in a small canning jar. I picked the jar size such that a moon clip, speedloader, or compact (G26 size) magazine would fit, but a full size mag wouldn't. I got the idea for that somewhere on this forum. I got a little bit of grumbling, but all the guys who brought revos loved it. I would never do it more than once a year or for more than 6 rounds.