The applied Ballistics litz number of .355 has worked well for me with the 156 out to 1230 yds as well.
Not to get off topic, just an interesting thought.
I have often wondered, when we adjust the b.c. (I have done it myself, though I generally prefer to adjust my muzzle velocity vs whatever a ballistician says a bullets bc is) of a bullet to get it to match up with our drops, how often is it really some other issue, such as getting skewed atmospheric readings from whatever instruments we use, our scopes tracking actually more or less than what they should be, up/down drafts from the wind, misinformation from our chronographs, or a myriad of many other possibilities or combination of these issues. Not discrediting your or anyone else's findings in any way, just a thought.