Ballistic coefficient... which one?

[cbonner]

I have a good load cooked up for my 7WSM, with the 160 grain Nosler Accubond bullet chugging along just under 3200 fps.

In reviewing the Nosler information on this bullet, it lists two different BC's. The first is PT,.475) and the second is AB,.531). Anyone know what the difference is between the two figures? Which one of these should be used for computing the trajectory? I plugged both into the trajectory calculator, there is a difference,albiet not too great) between the end trajectories, particularly in the case of wind drift.

Any information would be greatly appreciated. - Craig

 

[Cheechako]

Craig

I believe the "PT" BC is for the Partition bullet and the "AB" BC is for the Accubond solid base bullet.

Ray

 

[billmo]

That is correct Ray.