Form factor tells all, other than actual bc consistency and I'm sure we can all agree that the most consistent bullets are solids, followed by Berger, Hornady and Sierra.
At ELR, just using the highest bc bullet is not always the right choice if the bullet is too heavy to take advantage of it. That's where form factor comes in. Think of it is a power to weight ratio-lower form factor=higher bc for a given weight. If form factor for a particular bullet is not provided, simply divide the sectional density by the G7 bc.
Some examples:
I run a 300 Norma with 250 A-tips and N570 roughly 2975 fps. The form factor for this bullet .853. Another popular .30 caliber bullet for this application is the Berger 220 LRHT with a form factor of .897. I would need to launch this bullet at roughly 3550 fps to exceed the wind performance and retained velocity of the 250 A-tip at ELR ranges.
Another one just for shits and giggles:
If I wanted to single feed and stuff a 250 A-tip into a .308 and launch it at 2200 fps (just a guess), if I pick the highest bc bullet in the 175-185gr weight class like the 175 A-tip with its measly .933 form factor, even if I launch it at 2750 fps it's performance is inferior at long range.
1000 yard numbers:
250 A-tip @2200 fps 10mph wind-64.6" Retained velocity-1365 fps
176 A-tip @2750 10mph wind-80.6" Retained velocity-1364 fps
Even when I run the 245 Berger @3000, I would need to push a 220 LRHT @3250 to stay close. Is that possible, not sure I've never tried it. But the 245 EOL form factor is .893 and it's not a closed nose projectile so it's form factor can be improved upon, while the 220 is already the best in class hybrid target with a form factor of .897.
At least for my application, I feel the heavies are the way to go in the Norma and the bullet with the lowest form factor, in most cases is your best option.
I see no reason other than impact signature or splashes that a 300 Norma, PRC or other large capacity .30 would not do well at least out to 2100 yards.