Journeymen went on their walkabout to gain experience from several gunmaking centres. Typically they wrapped this up by age 24 and made some component of a sporting weapon and with the other sourced components submitted it to the local guild to gain their master's sheepskin. Missillieur must have flounder for a time or really extended his walkabout as being born in 1781, he should have been a master but the early 1800s. Sometimes they were apprentices in other crafts and switched horses or he could have gained experience in a couple of associated sporting weapon crafts.

Kind Regards,

Raimey
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