Hi,
The idea of gunmaking as a wintertime occupation in the 18th and early 19th centuries always intrigued me. Short days, low levels of light, cold, heating requirements to apply and dry finishes all make me skeptical that gunmaking was a winter thing. I think in winter farmers and most people spent a lot of energy keeping warm, preserving food, perhaps hunting, sustaining livestock, splitting firewood, and digging out from snow much less working at gunsmithing. I don't think winter was a "down time" affording other activities like gunmaking.
dave