Never had a squib load get the bullet stuck in the forcing cone have ya?
Revolvers are not jam proof.
I don't think anyone is calling them jam proof. But I can think of more issues with a semi that can lead to a jam than a revolver.
Know the status of your weapon
Keep your muzzle oriented so that no one will be hurt if the firearm discharges
Keep your finger off the trigger until you have an adequate sight picture
Maintain situational awareness