get a nice 1901 or 1902 rear sight, slap it on that rifle, put a tall blade on the front 1905 sight, then "bring up" your rear sight till it hits where you want. Whatever ammo you use it is not likely to be calibrated to the rear sight BUT MAYBE, if the front sight blade is tall enough you could file it down till it is a match. let us know how it works out for you.

I shoot nothing but cast so I just need to know my dope, like 200 yards is good for a hit at 100 yards.

God luck