Here's one I can recommend. Based on his examination of originals and an honest value in a custom fusil. May not be "the best" but it is darned nice. ("The Best" grade Fusil de Chasse would be a Fusil Fin, wouldn't it?)
John Donelson - Longarms.
French Tulle Fusil De Chasse Ca. 1691-1741
Fusil de Chasse (hunting gun) and the Fusil Fin (Fine gun).
The eye pleasing lines of the French Fusils look great even on the plainest of guns. This example would be considered a Fusil Fin since it has very fancy curly Maple wood and raised carving.
These "Chief grade" guns also came mounted in brass and sometimes with silver medallions or inlays. The plainer Fusil de Chasse was usually iron mounted and stocked in plain walnut or maple with little ornamentation.
Just good clean elegant lines! Original French Fusils exhibit an unusual undercut treatment on the comb where it meets the wrist, not often seen on recreated Fusils today.
Barrels usually 44" Octagon to round and .20 gauge. Prior to 1720 the Octagon generally faded into the round with no boundary.
After 1720 the Octagon transitions to 16 flats for an inch or two then a wedding band transition to round, see Bouchard's "The Fusil de Tulle in New France 1691-1741".
To build a Fusil de Chasse from available parts ... $1,495.00