Book Review - Applied Ballistics For Long Range Shooting By Gustavo F. Ruiz

[BryanLitz]

norsepeak,

Converting a G1 BC to a G7 BC is tricky because the conversion factor is different at all speeds. As a rule, if you have a G1 BC that's valid for muzzle velocity (~2800-3000 fps) and you want to convert it to a G7 BC, the conversion factor is simply 0.500. Most G1 BC's that are advertised by manufacturers are for high velocity, so the 0.500 conversion factor would apply. However, a G1 BC that's an average value over long range can be converted to G7 with the factor 0.512.

Keep in mind that converting BC's can be misleading. Depending on how the G1 BC was established (tof, velocity, or drop), the number can be different for the same bullet. Converting G1 to G7 might not produce an accurate result.

I'm glad you like the book.

Take care,
-Bryan

 

[norsepeak]

thanks for the reply, I sent you a p.m. with a few more questions.

 

[dbooksta]

Has there been a discussion of one of the main points of the review: Namely, that Pejsa's ballistic model has been incorrectly described?

My understanding of Pejsa's method is that he just fit an analytic function to a standard (presumably the G1) model.

Mr. Ruiz, since you've done so much work with the Pejsa model, could you offer the detailed characterization you think has been missing (including in the subject book)?