A small amount of play (side to side) is normal and acceptable and there will more than likely be some charge holes lining up that are tighter than others. A huge amount of play should be addressed. When the trigger is squeezed it should be locked up tight just prior to the time it falls, even if there was some play before the trigger was pulled. When the gun is empty pull the trigger and hold it - then check the play again. If it is locked up tight you should be good to go.

Front to back play should be minimal and not really noticeable. A tiny amount is OK, but if it is too much, it should be shimmed tighter.

I just go by feel, and do not use any measuring devises. After a time period of playing with revolvers you'll get to know what is too much, too little and just right. Hope that helps........

Regards,
Chief38