Jim,
I know you were discussing dry firing with the set triggers only and you made an excellent point about ensuring the cock and frizzen is forward. :thumbsup:
However and while this type of dry firing is better than no dry firing practice at all to improve one's marksmanship, it is not as good as dry firing with the lock actually working - whether using a wood flint or real flint.
Now smaller civilian locks will not disturb the point of aim as much as larger "Trade Gun" or Military Locks, but they will still disturb the point of aim some - compared to dry firing without the lock working.
Dry firing will improve marksmanship the best when a small target is placed to aim at and the lock actually functions and everything is as close to firing as possible without a round actually being fired. I first learned that in the one week "Snapping In" session in Marine Boot Camp where we spent an entire week getting into the different shooting positions and dry firing. Only a few years later when I first was assigned to THE Marine Corps Rifle Team as an Armorer, the shooters used to say that one needs to dry fire at least 50 times in practice (and in each position while wearing all the same gear as when actually shooting) for each actual live round fired during a match.
Serious and winning NSSA shooters dry fired their Civil War period guns by actually putting on at least their repro shirts and jackets/coats to dry fire and with the locks working, for the same reasons. Serious and winning International Muzzle Loading Competitors did the same thing with their guns and equipment.
I may be one of only a small percentage of hunters who do it, but I dry fired with whatever ML or modern gun and while wearing my hunting gear, before I went hunting each time.
Gus