BC numbers suck
Flat base bullets and BC numbers suck even more.
For many FB bullets as velocity drops, BC increases. Less speed= less drag= less velocity drop= higher BC. Then nose profile comes into play along with shooting conditions.
Best you can really do is " the BC of that bullet, on that shot was ......
If you use actual drop over distance and correct shooting conditions, Then you can adjust the BC in the calculator until it matches. As long as velocity, sight height, wind, shooting exactly east or west and everything else are exactly correct.
When I plugged both 360 & 460 into the calculator I got a 1/2 MOA difference in drop at 300, or 1.5 inches. If my scope is MOA with 4 clicks per, I need around 1.5 clicks to be dead on at 300. A 20%+ difference in BC only made a 1" error(1/3 MOA) at 300 yards.
So I have 1/2 MOA discrepancy in bullet BC and my scope settings are only accurate to +/- 1/3 MOA, plus all the other factors I can screw up in the calculator. There's a reason I failed tactical sniper school for first round hits on dimes at 300 yards.
I am not saying correct BC is not important, but the shorter the distance, the more wiggle room you have, and the harder it is to see the value. Basically I know enough about ballistics, to know that I don't know enough, to make precision first round hits at any distance. Busting clays, or hitting steel I have a fighting chance.
Hope that all makes some bit of sense
This is Sierra's BC file for all their bullets. They are very good at listing corrected BC numbers for velocity. if you look close, you find bullets where The BC increase or decrease with velocity drop and a few that lose BC then gain it back as velocity drops.
https://www.sierrabullets.com/wp-conten ... -rifle.pdf