I am going to work up a load for my 7mmRemMag, 26" Criterion barrel, with 1:8 twist using 175gr AccuBond Lr's. I am figuring on getting 3,000fps or close to it.

I also want to buy a calibrated turret knob for the load for my Swarovski X5, and I know how important it is to enter the proper input for it to be accurate at long ranges.

With this in mind, I am wondering what the correct BC is.

Nosler's updated BC for the 175gr 7mm ABLR is 0.648 using G1.

From what I have read, BC changes with twist rate and velocity.

I don't know what twist rate Nosler used for their .648 BC but my twist rate is 1:8"

So how would/do I determine the actual BC for my load?

Any input would be greatly appreciated! Thanks