Norval, this process is universal to revolvers. youtube.com/watch?v=JII__KNLYY0

Open the action and spin the ejector rod gently. It should not wobble at all. If it does, someone has made a habit of "slapping" the cylinder shut. You know, just like they do in every movie and television show. I sometimes get arguments on this, but the practice kills good guns. It leads to the heartache of bent cranes, warped ejector rods, worn-out cylinder stops, and broken homes. I've seen direct evidence. If the rod wobbles, walk away: it costs too much to fix.
Close the cylinder. Pull the trigger to the rear, but keep it pulled once the hammer’s fallen. This puts the gun in full lockup. The cylinder should not have excessive movement from front to rear. A slight bit of play is normal, but more than the thickness of a driving license means that the gun is likely shot out. These things are strong, but not invulnerable. An unfortunate mix of alcohol and handloading can lead to a life of regret and a gun nobody wants to buy.
While keeping the trigger pulled, wiggle the cylinder side-to-side. Again, there will be some play, but if it feels like it's going to trip over to the adjacent chamber, the gun is either out of timing or the cylinder stop (or attendant spring) is abnormally worn.