What Boyt gun case for a 5.5" Bisley

Anyone here use the Boyt brand triangle shaped soft gun case for their Ruger Blackhawk with the Bisley frame and 5.5" barrel? Is it the 10" , 12", or the 14" that fits it best?

I use the rectangular ones for every thing under 7.5" the triangle ones I've seen won't take a scope and you can use the rectangular ones for a seat pad in a pinch