44 Henry round. Henry also supervised a brand new rifle design centered loosely on the Volcanic to work with the new ammunition, retaining only the general sort of the breech system as well as tubular magazine. This turned the Henry rifle of 1860, which was produced by the New Haven https://highimpactrounds.com/product/winchester-target-7-62x39-123-gr-fmj-2355-fps-20-rd-box/