I have meant no disrespect to anyone. If it's come across that way then I appologize. I have come here for the wealth of information that some of these old timers have, but it seems like these old timers that I am speaking of are trying to answer before I can even get the question fully asked or are not completely reading the questions in the posts.
Case in point, my original first post said I what ammo I am using, then the first expert reply asked what ammo I am using...
In my first original post I mention that I am using the formula for calculating front sight height, then I get a reply from the expert saying "hey, you ought to try out this formula that I've been using for years...
In my post above I said that I have a 25, 50 and 100 yard range at my disposal, then I get your reply saying I should shoot on a 200 yard range...

I don't at all doubt the knowledge base of some on this forum it just seems like there's some kind of race to give me an answer, any answer, before pausing a sec to consider exactly what I am asking.

So far BrianDick and Parashooter have given me the most useful information. That since I am using lighter ammo I cannot rely on the actual numbered marks on the sight to be accurate and that I must memorize or record clicks from zero or from bottoming out to establish ranges that I wish to shoot on. This is how I have set the sight on my AR15. Establish a 25/300 RIBZ and then -4 clicks for 50/200 and -6 clicks for 100 yards.
My original questions were to check the accuracy of my math on front sight height formula, see what difference there would be in the 174 grain vs 150 grain ammo, and confirm my suspicions of a trajectory of zero minus 3 clicks at 100 yards after a zero was established.

Now judging from the previous replies to my posts I suspect the next one in line will be from an expert telling me that I can't attach and AR15 sight to my Enfield.