I went the other way and put a six shot cylinder in a 7 shot gun.
I never expected it to function but it went in and worked fine. with no modification.
I picked up two new hands off fleabay JIC and didn't need them.
YMMV
Thanks for the input. I've heard a few mention that there seemed to be no apparent difference when switching and some say that hand fitting was needed. I would agree with JohnK's thinking about how it should work. Perhaps I should pick up the cylinder and a hand and go for it. If it doesn't work, I can switch back.