That rang a bell with me. There was a great article about the Grouseland in the November, 2016 issue of American Rifleman.

The original rifle was built by John Small, a Revolutionary War gunsmith.

Quoting briefly from the American Rifleman article:

"While John Small possessed an arsenal of talents, his work as a gunsmith was particularly valued on the western frontier. Of the five John Small rifles known to still exist, most are associated with significant historical figures of the period. Explorer William Clark owned a signed John Small rifle, which now resides in the archives of the Missouri History Museum. The Indiana State Museum holds two John Small rifles, a tomahawk, pistol and powder horn: his “Vigo Rifle” was owned by Col. Francis Vigo, an Italian trader who aided in George Rogers Clark’s capture of Fort Sackville in 1779. The “Girty Rifle” is believed to have been owned by either Simon or James Girty, brothers infamous for their anti-Colonial allegiances. The “Menard Pistol” was crafted for Pierre Menard, notable as the first lieutenant governor of Illinois."



"The original “Grouseland Rifle” (shown here below its modern counterpart) is the official rifle of the state of Indiana. Its maker, Col. John Small (r.) was regarded as one of the finest gunsmiths west of the Appalachians and had been a soldier during the Revolutionary War. He eventually settled in the Northwest Territory in Vincennes, Ind."