I have two 88's a un modified 1894 Spandau (other than S) with the 2000M sight and a 05 modified 1891 Loewe with the 2050M sight.
I haven't taken the 94 out yet but, the 91 shoots about 6" high at 100 and and almost twice that at 200 with cast bullets of 210 gr cast GC at 2200 fps. The 05's have sights on them that are suppose to handle the 154 gr 2880 fps loads so, I would have expected it to shoot low.
I've read other accounts of 88's shooting high but, I don't remember how high or what load.
My question is........... Is this common on any or all 88's? Or are the barrel vibrations doing this?