According to old texts I've read , the squirrel rifle became not only popular , but very necessary when corn fields expanded and most of the large game animals were gone. Squirrels migrate in mass when woods food in one area runs out , so a nice corn field is easy pickin's for the tribe. Hunted through two migrations in my 60+ years , and not a lot of hunting skill required to kill a nice mess . Shooting matches became very popular for entertainment as well . The style of rifle used for squirrels were mostly post 1800 era pieces. Stocks were slim , some were highly decorated w/ inlays , and most had little carving. In the back country of Appalachia where shiny unnecessary decoration was put aside , rifles were considered tools folks carried for protection and if game appeared , to gather a meal. Seems like most "squirrel" rifles were between .25 and .40. I'm with the crowd that likes the back woods ugly old looking .40 , made out of rusty repurposed parts. My favorite .36 for farm hunting had no butt plate , and both walnut stocked rifles showed only a grease /patch hole in the side. Utilitarian to the max. , lock stock and barrel. ...........oldwood