Without accuracy BC means little.
The problem is the longer you give it, the more ways time of flight finds to screw up accuracy and at 100 yards there is no way to discern what those impacts are going to be.
Starting with a default 26" 338 Lapua shooting 300 grain ATips at 2750 fps. A 10 shot string with 30 fps velocity ES and 3% BC spread was assumed.
Beyond 2000 yards, it continues to change until the 1000 yard priorities are completely reversed.
I produce these diagrams from range cards exported from AB Analytics. It's easy enough to crunch out 1 point with most solvers, this format was selected to show the bigger picture.
We can use these to look at 3 ways to potentially improve ELR performance, ammo consistency, raw velocity, and raw BC.
Starting with ammo. Beginner or entry level approximates factory match ammo, 60 fps ES and 6% scatter on the BC. Intermediate is 30 fps and 3%. Advanced is 15 fps and 1.5%. All for what you can be reasonably confident the next 10 shot string out of the ammo box will produce. ES is actually a poor way to do statistics, but it's what we tend to recognize through the scope. I'm using 4X the SD to estimate ES. 19/20 shots should fall into that estimate. 2/3 will be within 2X the SD. ELR shooting strategies generally try to figure out where the center is to keep as many of those 2/3 on the target as possible.
If we plot just the RMS values for each level, it looks like this for that 338.
I've plotted wind as well to give a sense of the relative sizes of the vertical and horizontal problems. 2 mph of wind in this context mean you can pick up and respond to a 1 mph change in wind. That might be 1 mph up or down, or a small change in direction.
I have a couple more plots with 140 ELDm from a 6.5CM and the 300 ATips at 3050 fps from a 33XC. These illustrate the effects of improving the time of flight by way of muzzle velocity or BC. The short version is 100 fps moves the curve 75 yards. A 10% improvement in BC moves it about the same.
The trick is selecting the velocity and BC that moves the curve as far down the course as possible before starting to incur penalties that start shifting the curve upward.
Shooters new to ELR are better off with relatively inexpensive easy to source equipment and ammo components. Until they can load Advanced level ammo, a smart alec with a 6.5CM might take their 338 apart at a mile. Most won't be able to duplicate the consistency of commercial match ammo with their first attempts.
This stuff is easier to internalize if you shoot with a large, responsive and relatively steep backstop. Even with that, it didn't really start to be obvious until accurate chronos that were easy to use anywhere became available. The high impacts from slow shots started the cognitive dissonance that eventually led to this. Litz had sections on BC variation in his second and third advancements books. AB also has a couple white papers online. The AB CDM data sheets that have been made public also add perspective.