smoothshooter
50 Cal.
When creating a short-barreled “American jaeger” that is historically plausible one has to think “why?” When, where, and why would a short barreled rifle be made from scratch in the colonies? Were longer barreled rifles being made here at the same time? If so, who was the customer and why did they not prefer an import at likely lower cost? So to me the most likely scenario for an American “jaeger” is a restock of a rifle made in Europe and broken or worn out here. And it would likely be out of style and in a corner by 1790.
Shorter guns are easier to cover up with a coat or a cape or piece of canvas in inclement weather.
Also easier and faster to reload.