Gimps...you got me all excited there for a moment.
But please don't advise people to store guns with snap caps in place nor to fire them off, as it were, when putting them in the gun.
First it isn't necessary. There are many shot guns that are now over one hundred years old that have never been "fired" off before being put away and they show no ill effect.
Second familiarity breeds contempt and it is an accident waiting to happen in that you may one day be on "auto-pilot" and put two live cartridges in the thing and fire it off.
Third it creates a metal to metal contact on the face of the breech in the chambers and a potential to aid the formation of rust.
A tip to prolong the time it takes for that nice colour hardening to wear off. Get a small tinlet of clear matt or semi-matt varnish and when first new and then at the end of every season if necessary paint the action with a very very thin coat of it.