Because this is where the Pennsylvania Longrifle (aka Kentucky Longrifle) originated, visitors see how gunsmiths of the 18th century manufactured rifle barrels.
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In Swedish service, the 6.5×55mm cartridge was used in the Swedish Mauser family of bolt action arms comprising the m/94 (Model 1894) carbine, m/96 (Model 1896) long rifle, m/38 (Model 1938) short rifle and m/41 (Model 1941) sniper rifle and the Ag m/42 semi-automatic rifle.