Man, that's a beautiful rig!
I've found that once I learned the proper technique and practiced I can easily out reload an auto with plain 'ol normal speed loaders like HKS or Safaris. Of course an auto usually comes with more rounds to start with, but if I was firing a 12 round course against an auto that had less than 12 rounds in the mag, I can reload my revolvers faster than I can reload my autos and get 12 rounds off much faster and I've been trained and drilled on reloading autos for almost 20 years, whereas I've only trained and drilled reloading revolvers over the last year.
I think the problem with speed loaders is that a lot of people tend to use them wrong. The natural tendency is to hold the gun with your strong hand and try to fish the speed loaders in with your weak hand. And as law enforcement has all but stopped using or training with revolvers, the techniques are getting lost and forgotten.
If you haven't tried this already, with a speedloader, from a firing position, bring the left hand up from the grip to the underside of the frame, holding the gun with the left hand and use the left hand fingers to push out the cylinder as you use the right hand thumb to unlatch the cylinder. Then, still holding on to the gun with your left hand, turn it with the barrel pointing up, smack the ejector rod with the right palm, then go for a speedloader with the right hand and insert the speedloader..then simotaniously drop the speed loader, close and cylinder with the left hand, while the right hand comes back up on the grip and go. With the strong right hand doing the speed loading, it will be much easier and more positive.
The one drawback to speedloading is that you can sometimes lose or drop rounds. Holding the gun barrel end down at an angle so gravity helps insert the rounds and keeps them in the cylinder as you pull the speed loader away, helps with this.