[Vlad0]

Just spin the cylinder while looking at the holes! OK but if I'm looking at the holes the muzzle is pointed at my eyes, too. So, maybe I could point the revolver up at something like a 15 degree angle off vertical, and the revolver would be pointed in a safe direction, and I could still see enough into the cylinders to determine if the gun has blanks or live ones.

I'll have to experiment, but off hand it seems clumsy and potentially dangerous.

I'm imagining pulling the "lets see if these are the right bullets" inspection on a SAA at the range, and the Range Safety Officer and other shooters being quite unhappy with me.

[JBW1949]

Just open the loading port or swing out the cylinder (depending on what type revolver you have...Shake out or remove the rounds from the cylinder...See what they are (live, dummy, or blanks) and reload the cylinder...
You don’t have to look at the head of the rounds with the barrel toward you...You don’t have to look through the tiny space between the barrel and the cylinder...

So simple and easy...