I am shooting Steel Challenge also. I did swap in my 4" 6 shooter for a 6" 10 shooter. I was doing ok with 6 shots, however trying to speed up I feel a little more secure with a little more ammo on tap.
I am reloading with a Speed Beez Loader and Loading Block.

I have not started shooting it yet, but I also added a 627-5 PC ( 8 Shooter) to my stable. I have moon clips for it, but I decided to also go with a Speed Beez Loader and Loading Block for it. That will keep me from sorting cases for the moon clips.

I have a Ruger MK IV also. I may shoot it some.

The semi auto's seem to all take spells of malfunctioning due to clips, ammo, etc. The 617 always completes a stage with the ammo in the cylinder.

Bob R

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