Did you happen to contact Brownells or Story about the misfit?I have one of the Story cylinders - bought from Midway a few weeks ago. It ran $120 thereabouts. It's a magnum cylinder - and they have fit well for everyone but me! It's an 8-rd version - it fits the cylinder window perfectly and the B/C gap is a little large but fine. But, it does not time correctly on my 1984-vintage Single-Six. Interestingly, six of the eight chambers line up perfectly - but two are off too much to be safe. I've decided to keep it anyway since I'm on the lookout for another Single-Six.
That said, they're fairly reasonable, hold two more rounds, and have worked fine for the majority of people who've bought them. Just something for you to consider ...
Great advice Sir - thank you very much!! You, and Wave, and others make this such a great forum!! I just wish I had the resources to pick up more Ruger revolvers!! OK, I won't beat around the bush, resources in my case means money – I am on a fixed income ...That's what I thought. Your hand is too long. For an 8 shot cyl the cyl only needs to be rotated 45 degrees, not 60 degrees like a 6 shot. Take a slight bit off the lower tooth of the hand (pawl). There is variance in the cyl rachet teeth dimensions of all cyls.
Your hand is holding the cyl too tight against the cyl notch, it needs a little play so the barrel forcing cone can do its job of allowing the bullet to ctr the chamber as it comes out of the throat.
The hand will still work properly with your factory cyl.
OR you can just slightly slim down the bottom surface of the two ratchet teeth where the hand contacts them, for the two chambers.