I use thick gasket paper, from the auto parts store, for wads.
Cut slightly over sized in diameter, they seem to prevent chain fires from the front.
Haven't had one since using these.
And they don't seem to even need to be lubed to work.
Chain fires can do the most harm to the gun if the round in the lowest chamber goes off into the frame, under the barrel.
The others just fly off out of the sides of the cylinder.
All the chain fires that I've ever had only involved one or two chambers on either side of the barrel.
And they merely left a mark on the frame, no harm.
Lock the doors, they're coming in the windows.