44 Henry spherical. Henry also supervised a brand new rifle layout centered loosely around the Volcanic to work with The brand new ammunition, retaining only the overall sort of the breech system and the tubular magazine. This became the Henry rifle of 1860, which was produced by the New Haven https://highimpactrounds.com/product/winchester-aa-12-ga-2-75in-1-1-8-oz-8-lead-1145-fps-25-rd-box/