06-14-2016, 02:44 AM
I've come to the conclusion that the advertised G1 BC of .510 for the 123gr Amax is only for higher velocities. Once it gets to a certain velocity, it the BC actually changes on the G1 drag curve models. That's why Sierra bullets will put out a stepped G1 BC on most, if not all of their bullets for different velocities. My data with the 123gr Amax matches pretty close to around the 800 or so yard mark, but then progressively gets further and further off the farther I push it. At 1k, it's usually 1.5-2 minutes low. By the time it's out to a mile, it's around 15 minutes low.
This is where the advantage of the G7 drag curve comes into play. It is consistent across the entire velocity spectrum. I only wish Litz would put out a G7 curve for the 123gr Amax.
Here's an example of the Sierra stepped G1 BC calculations:
https://www.sierrabullets.com/store/prod...-MatchKing
This is where the advantage of the G7 drag curve comes into play. It is consistent across the entire velocity spectrum. I only wish Litz would put out a G7 curve for the 123gr Amax.
Here's an example of the Sierra stepped G1 BC calculations:
https://www.sierrabullets.com/store/prod...-MatchKing