bc of m72 match

[Cosine26]

The information I have from years ago is that the BC of the 30M72 bullet is 0.53.
On the boxes of FA 60 and LC 62 Match ammo the MV is given as 2650 fps which coincides with the info in the 1963 National Rifle Matches booklet. In the Rifle Marksmanship Manual this is indicated as the MV for a temp of 70 degrees F. As the temperature rises the velocity rises to 2750 at 100 degrees F according to the manual.
Formerly the BC was computed from data measured by measuring the velocity difference between screes placed at fixed distance. In recent years this has been replaced by measuring continuious velocity data using a Doppler radar technique which provides a steady flow of velocity at different ranges. Some revision of previously quoted BC's have been made based upon this later data.
A good essay on exterior ballistics is contained in "Hatcher's Notebook" (the later editions.) Mine is the Third Edition of 1962
Hope this helps.
The ballistics data for the M72 Match should fairly well duplicate that for the old M1 ball ammo.