If I remember right, a Henry rifle has dual firing pins and leaves 2 marks on the case. Henry's and Winchester M66's were both .44 rimfire. The "H" on the Winchester .44 ammo was left there to honor Tyler Henry, inventor of the Henry rifle. Gary
older post civil war -- the 1870 - 1880 " rimfire" era modern smokeless powder rifles were often in smaller pistol type calibers --so that you only needed 1 ammo for both pistol and rifle ---32 -20 (32 cal bullet --20 grains of powder) and 38 /40 were common rounds