Need info for the BC for Prvi Partizan 6.5x55 bullet

[Dieselbuilder]

My son is using his Kimber of America sporterized Swedish Mauser in 6.5x55 for deer hunting this year using Prvi Partisan PPU 139gr BTSP ammo.

I am trying to find out the BC of that bullet so we can input it into the ballistics program to figure the drops.

Can anyone help me out?

Thanks in advance.