Re: .243win 75g vmax help
You're listed BC of .33 is either incorrect (It's an advertised number by Hornady) and is not working with your system. Or your optic is not tracking true.
Bullet drop doesn't lie.
3,4 and 500 yds is not far enough to "true" your velocity and bc.
You're putting in bad info and you're getting out bad info.
It would probably be easier if you list ALL of the data you're putting into your app so we can either try and duplicate, or correct the issue...because the drop chart you're getting doesn't jive.
These are the numbers where you're making contact?
200 - .75 MOA
300 - 3 MOA
360 - 3.5 MOA
400 - 3.75 MOA
500 - 7 MOA
Just by looking at the numbers, something is WAY off.
You need 1.25 MOA additional elevation to go from 200 to 300 (not impossible)....but then from 3-400, you only need an additional .75. This IS impossible.
I'll give you the atmospheric data that I have here currently, with the published .33 BC and I'll show you what I'm talking about. This is not necessarily true for you, just an example.
My station pressure is 28.45, temp is 80, powder temp is 80, humidity is 50%, velocity at 3500,
Range card craps out numbers as follows.
100 - 0 MOA
200 - .5 MOA
300 - 1.9 MOA
400 - 3.8 MOA
500 - 6.1 MOA
600 - 8.8 MOA
700 - 12 MOA
800 - 15.7 MOA
SO, if you take your rifle out and shoot at 800 yds, and you need 16 MOA to get on target...then one of two things is necessary. Either you're velocity is off or your BC is off. Take a shot at 400 and note where it impacts on the target.
You'll have two TRUE numbers. 16 MOA at 800 and (for example) 4 MOA at 400.
When you consult the range card, you see these don't match up, so either the velocity or BC is wrong.
To check, you can adjust your velocity and bc until you get a combo that matches BOTH of your real world bullets.
"We do not rise to the occasion...we fall to the level of our training."
Last edited by c_bass16; 07-08-2013 at 05:23 PM.