over 2512 fps .351

2232 fps .332

1953 fps .321

They used the Doppler radar system to determine these more precise BCs. These are all calculated using ICAO standard conditions

Using ballistic ae with .351 BC and starting velocity of 2600fps at 540 yards the fps drops to 1954.

Question #1: when shooting past 540 yards, should I use .321 as my BC in the calculator? If so, how would one account for the better bullet performance (b/c of better BC) as the bullet travels from zero yards to 540 yards.

Question #2: do any of the BC calculators have segemented BC inputs?

Question #3: although a 6.5CM is not optimal for 1760 yard shooting, with either a 140 Eld-x match or 147 Eld-x match, how will this bullet perform past 1400 yards since it is drops subsonic or even before 1400 yards as it transitions.

many thanks in advance for your advice