Hungarian YouTuber capandball gives us a look at the world of blackpowder rifled-musket competition shooting, with his original Springfield 1861 Rifle-Musket, manufactured at Bridesburg:

The original guns, when coupled with Minie-style projectiles, can provide quite surprising accuracy for a weapon of their type. The rifled-musket was a development of the 1840s, and made possible by the development of conical projectiles with a recess in the base, creating a ‘skirt’ reminiscent of the protective accouterments of late-Medieval steel place cuirasses. The new weapons combined the rapidity of fire of the musket with accuracy approaching that of slow-loading rifles, and signalled the last major development in firearms before the introduction of the mass-produced breechloading rifle.