I'm having a custom Highwall built in 30-30. Neither front nor rear sight is adjustable. I can, however, mill off the rear sight base on the bottom. Right now the rear sight is .110" higher than the front sight. The sights are 22 inches apart. I calculated that the rear sight needs to be raised .009 to raise the point of impact 1-1/2" at 100 yds. That would be an adequate zero for a 30-30. I'm using the rifle bore centerline as a reference point. Is there any way to factor in the ballistics of the 150 grain factory Hornady cartridge into the equation?

Shoot a 100 yd group with your Hornady load. Use the location of the group, and your math skills to determine how much metal to remove. Easy!

If your front sight is a blade, why not mill down the rear base so the rear sight is lower than the front. Then take the gun to the range and file down the front until it zeros. If it is a bead, do what gwahir said. Either way, you need to shoot it first with your go-to load. Then adjust the sights.

Right now the gun should shoot 18.33" high. I'll just wait until I shoot it and trim the rear base accordingly.

I sight 3" high at 100 and thats usually on at 150 and 5" low at 200 with a hold on back line at 300 allowing for drop that I will find at the bench, I use a file and testfire at 100,200,and 300..I use a 5" post to file down to zero and/or a Redfield sourdough either one with a V cut on the rear and the top of the front sight flush with the top of the rear sight V, its fast and as accurate as a receiver sight..Used originally by the Texas Rangers.

This might help. If we were machining an integral barrel to your info, here is the rear sight to front sight height difference
for various zero ranges in Tennessee. The current 0.110" height difference gives a zero range of 420yds and 14" high at 100yds.
Steve

See what you get with a boresighter or with an eyeball look down the bore, since its a 94. I have better success without the math myself but to eacv his own.

Hornady reloading books give all combos of bullet weight, velocity co efficents, etc..I use the data with compelte confidence based on yars of experience
Having said that..just a couple test rounds at a known distance will tell you everything slse

It's a 3030 with irons, meaning 150 is a long shot, with 50 being more likely.. zero at 100, aim higher on the shoulder for 150, and a 6 o'clock hold for 50

Well, Mr. Vol717 OP is a different problem. He has a barrel with non-adjustable iron
sights and is trying to assess,before the rifle is built, if the rear sight base can
be trimmed, i.e. thinned (or the barrel dovetail deepen) for a reasonable zero range.
So at this point, only complex math or numerical analysis, such as the chart below
from QuickTARGET, can estimate if there is any hope to trim the rear sight base.