Range Report Which BC to Use??

[fx77]

Found three BC's for the 90 Gr. Berger on the net
.410,.411,.426

How does one choose?.here .410 and .411 are close, but .426 is much different...other bullets could have a greater spread.
Advise.
Thanks

 

[fx77]

Re: Which BC to Use??

Heres an example where BC is much different 77 Gr Sierra HPBT 223
one site BC =.372 and another it is .428

 

[turbo54]

Re: Which BC to Use??

I don't know which Berger 90gr bullet you are referring to. Based on your 2nd post about the Sierra 77 in 223 though, I'll assume we're talking .224" bullets.

Berger makes two 90 grainers in .224":

The 90gr VLD and the 90gr BT

Here are the numbers listed in Bryan's book:

90VLD: G7=.281 G1=.551

90BT: G7=.262 G1=.512

These numbers were arrived at by meticulous empirical experimentation by one of the world's foremost ballisticians, Bryan Litz, and published in his book "Applied Ballistics for Long Range Shooting".

If you don't own it, you should.

Hope that helped.

 

[leadbullet]

Re: Which BC to Use??

agreed, bryan Litz book is a must have for reloaders.