Since the parent case is the 30 Rem, the twin rimmed version is the 30-30......... cut down  down  and stuffed was what I was working on .......30-30 has a large rim and may or may not fit in your 6 gun.......I haven't tried my RedHawk yet.....
Your mileage may very ......

I had no choice..........I had a handful of old 30 Remington cases I goofed up and was casting 38-40 bullets ............so I had to buy a a 10 mm revolver....10mm/38-40 Buckeye Ruger BlackHawk and cause I am lazy  I had to get the Ruger Super RedHawk so I didn't have to switch cylinders and less work than a single action...
So I had no choice