@Formidilosus
I have a bit of a run on question. If your scope is verified to track, your zero is confirmed, environmentals are input correctly, height over bore is correct, velocity is known and BC used in your calculator is off a box of bullets yet your actual drops don’t match the calculations what would you recommend to be the metric that needs to be changed to allow your calculator to provide an accurate flight profile that can be modified to changing environments and temp adjusted velocities?
The BC on the box may or may not be correct. Berger, Sierra, and Hornady ELD-M/X’s have correct real BC’s. Others generally not. If you are using unverified numbers, especially solid coppers- yes, the BC is probably not correct.
As for everything being measured and correct and the data not lining up- in hundreds upon hundreds of rifles, I have not seen one
not track within .1 mil of the data provided- if all the data is correct. BC variation from rifle to rifle is ridiculously low- so low that it becomes a joke for the vast majority of shooters to be touching it. Put plainly, if one is using a verified G1 or G7 BC, and their data is off- it isn’t because of the BC.
As far as I’m aware, it’s only the BC/drag profile that can be corrected that will provide good data as environmentals (including temperature adjusted velocity) change. If there is another metric that fine tunes my dope more accurately I’d like to know.
The issue is that one cannot see the tiny difference in BC from rifle to rifle of actual measured BC from a bullet.
6mm 108gr ELD-M, 2,940fps MV.
Real .536 G1 bc.
10 points lower- about the maximum you will see in variation-
A whopping .1 mil difference at 1,200 yards. They are exactly the same to 950 yards.
The amount of people who could actually see and positively determine that a .1 mil difference at 1,200 yards is from the BC variation- and not from the dozens of other variables is laughably low. Positively perfect zero with high shot group- 20+ round group perfectly centered and/or offset input. Track reticle movement and precision at least every 1 mil for 10+ mils- and at least a 10 shot group at every mil…. It must be live fire, as lots of scopes get erector jump from recoil that doesn’t show on a static tracking board. Do this multiple times to get an average; input the average correctly.
Conditions perfectly measured- temp, BP, altitude, etc. Somehow get an area with absolutely zero wind the entire flight path of 1,200 yards. Then, shoot that same 20+ shot group on a single target, and measure the offset from center perfectly.
Again, it is near functionally impossible for people to positively determine if slight variations in BC are causing a .1 mil difference- at the ranges where a BC variation is causing a .1 mil difference. At sub 1,200’ish yards with most combinations that shooters are using, using a real BC is certainly not causing .3-.4 mils differences. Not even close.
