I have been working on this zeroing problem for a long long time
without success. I have learned to hit near center at 100 yards but
only by using a highly bazaar sighting technic. I would like to use a
normal one but cannot figure out what to raise or whittle down. Here
is the bazaar technic.

Sighting for 100 yards: The normal sight picture shoots low; and the
blade has already been whittled kinda low. To make the rifle hit
center (or at least center level) I align the flat of the rear sight
with the flat of the barrel at the muzzle. However, since this shoots
high, holding the picture of "flat to flat" I lower muzzle, raising the
bulls eye up to about half the height of the blade in the sight
picture. I end up with a sight picture of "rear sight flat aligned
with end of the barrel flat," bulls eye floating above the flats
centered about halfway up the blade.

Currently I think I should raise the height of the rear sight flat.
Any thoughts.