I have shot T/C&CVA for years and don't slap the side, as long as I remember to put powder in it it fires as it should.^ ^ ^ THIS ^ ^ ^ !
I too have observed better/faster ignition on patent breech side locks by wrapping the breech area to make sure powdah dribbles down into the firing chamber.
Not 2 weeks ago at the range too, as new guy was having trouble w/ whoosh-booms ... from a caplock no less!