I recall reading that the notches for the Cyl stop are directly outside the chamber on a 6 shot but the cyl stop notch on a 5 shot is between the chambers.
IIRC the article was referring to the development of the .454 casull in the Freedom Arms revolver. Unless I interrupted it wrong it was built in the 5 shot platform to keep the cyl stop notches between the chambers for adding strength.
yes that is true. and as pointed out, in some 6 shot rugers like the redhawk, cylinder notches are offsets to maximize the thickness in this area.



















































