My 1928 6,5x54 M-S carbine with 18" / 46cm barrel shoots all bullet weights equally well. My 1925 8x56 M-S comes with the special order 23,5/8" / 60cm barrel and I've only shot one bullet type in it, (which is accurate too). The wood is noticably thin in cross section, perhaps to offset the extra weight / length ? My 1927 9,5x57 M-S take-down rifle has a 23,7/8" / 60.8cm barrel. I therefore assume the special order, full-stocked longer barrel on the 8x56 M-S is just the rifle barrel given the Stuetzen treatment.