True, but the point is, the exact accuracy in the calcs is NOT going to occur in field conditions.

Go look at the wiki part of the link on air resistance and see how far off the pure physics approximation really is. When you add in the variables of environmental temperature, humidity and pressure, you get another significant change, but less than air density. Now add in the Fluids and Thermodynamics variables and it is another, albeit less significant change. The actual variation based on a properly sighted in rifle shooting ammo with a velocity SD of 5 fps or less is smaller than the change based on the calcs.

I derived my own set of formulas in grad school for 5000 and 9000 feet for a .30-06 with a Berger VLD at 2700 fps and interpolated between them for elevations between those. It took 3 months. My POI and POA based on my math at 5000 feet with a measured PTH as compared to 9000 feet with a measured PTH was 1.3" at 500 yards (no wind). No correction resulted in a difference of 9". It was wearisome, but, I learned some tricks I otherwise would never have discovered, or even thought of, had I not been trying to replicate conditions. Like air duster up to bore to bring down barrel temperatures, and a microtorch to bring them up. Shooting over range with precision is not easy. Understanding the contribution of variables is not easy either.

I also found that almost every rifle is really capable of 1-2 MOA if you eliminate or properly account for all variables. Unfortunately, can't be done repeatedly. Once you fire one round, the conditions in your rifle and the path of the bullet have changed and will not reliably return for several seconds along the flight path and many minutes at the rifle. This is also why I beleive in the heat sinks on high fire rate rifles and how I proved to myself that fluting is not really benefiicial to pure accuracy.