Trueing muzzle velocity vs BC

[seand]

The Revic has Doppler drag model option you can pick instead of G1 or G7. I don’t think it’s the same as AB or 4dof, but it has been accurate for me with Hornady 108’s and 147’s out to 900 with no truing needed, just enter good velocity data from garmin xero.

 

[Wrench]

I typically don't see the bc holding as well once the bullet gets close to the trans zone. Beyond that point twist adjustments can help get closer...but I am still working the kinks out.

 

[StopMakingSense]

Just to make sure I'm barking up the right tree, here's what I did on my new round to true with velocity. This is for field shooting, I don't care much past 1,000 yards.

7 SAUM / 162 ELD-M 46.6gr H4350 22" Barrel / NF NXS 2.5-10

Set my zero, I did a large shot group, moved .25 MOA U and 1.00 MOA R



I then shot out to 437 yards and guessed 2850 FPS (no chrono on hand) on my load. AB was telling me my drop from the app with their custom drag model to dial 6.75 for a 31.1" Path



I shot 3 rounds and found I was 2.04" low



I adjusted velocity then to 2781 to achieve 33.1" of drop at 437

 

[6.5x284]

If my solver has G7 for the BC, I true velocity in the 500-600 yard range, and BC at the 1000+. If my solver has custom curves, like others have mentioned, I just run with my velocity from Garmin or Magneto and just fine tune from there if needed. My Magneto speed needed a little fps tweak here and there. My Garmin with custom curves has felt like cheating.

 

[Formidilosus]

@Formidilosus any thoughts on here for your true up out to 1000m?

The amount of people that can see, and correctly adjust tiny differences in BC from shooting is laughably small. Use legit BC values, true velocity and you’re done.

 

[StopMakingSense]

Perfect, thank you

I did not take the 7mm 162 ELD-M BC (.670) from the box. I used the CDM on AB then had it return the G1 of .640 to use on my Leica 2800.COM