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Does anybody know what bullet weight they were sighted with? Given the closest leaf is 200, the difference between 150 and 180 gr won’t be of significance at 100 or 150 yards. That works for me as the longest shots I can get on deer where I hunt is 150 across a field, and for bear, much closer than that! Middle-aged eyes aren’t that great for open leaf sights then again, if a Lyman cocking piece aperture is ever found, that may be an option.

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A 1929 Steyr Rifles, Guns & Pistols catalog gives the contemporary loads and ballistics for the then Mannlicher – Schoenauer rifles. Two loads are listed for the .30-06 Springfield aka 7.62x63, a German and an American one. I don’t know which one was used for regulating the sights.

As you are looking for a cocking piece aperture sight, this old thread may give some ideas.
http://forums.nitroexpress.com/showflat.php?Cat=0&Number=151111&an=0&page=2#Post151111
Such an Ersatz – Sportarget sight is on my Gibbs M1900 too. See
http://forums.nitroexpress.com/showflat....;gonew=1#UNREAD