Should end shake be measured from the back of the bullet casing or the back end of the cylinder. If the cylinder has a snug fit, say .002" end shake, but there is .020" behind the casing, then surely the casing is going to slide back and hit the frame with each firing. I have a lot of space behind the casings, maybe .095". I can make a washer shaped fitting of about 1" outside diameter that will hold all six cartridges tightly in the cylinder or a crescent shaped fitting that will fit behind the casing lined up with the barrel and ramp up to that point. Can anyone follow what I am trying to say here? What do you think?