That's my new 5.5" barreled Pietta 1858 New Army in .44 caliber, so far my new favorite.
At just 2.5Lbs & packed with 30gr. FFFG Goex & a .457 Ball she packs a good punch at 815fps. 212ft. lbs. & she'll hit POA at 25 yards with just a 1.5" left group pretty consistently "as long as I do my part."