IF you believe the numerous period documents from the Post AWI period about hunting with surplus military muskets, such hunting with small shot to buckshot, to "ersatz loads" of scrap metal/glass/pebbles & patched round ball was commonplace for hunting & frontier defense.
(During TWBTS, CS Marines & CSN sailors liked the Bess for repelling boarding parties, using "fluff", i.e., "mixed loads of broken glass, shot & scrap metal".)
A Bess is simply suitable for any number of varied loads, sturdy/unlikely to break, has plenty of power & quite versatile, when compared to other available flintlocks of that period.
Here in Texas, after our Revolution against The Dictator & up until TWBTS, the most common long-arm was likely the Brown Bess.
(Several thousand Bess muskets were abandoned by deserting Mexican troops or surrendered to the Texas military forces after The Battle of San Antonio & after San Jacinto. = GEN Houston allowed any TX militiaman, who wanted a Bess, to take one or more muskets home after the war.)
just my OPINIONS, satx