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Queston on Vortex scope w/BDC Reticle

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Unread 04-07-2013, 10:05 AM
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Join Date: Jul 2011
Location: Near Napoleon,MI
Posts: 1,192
Re: Queston on Vortex scope w/BDC Reticle

If you scroll up to the top of this page and look at the horizontal menu, you will see there is a menu item "G7 ballistics calculator". It requires its own signup, seperate from the forum.

Take some time and familiarize yourself with that tool. Go to the manufactirers websites for the bullets and ammo that you intend to use and take note of the BC's of the bullets and the MV of their loaded ammo.

Basically, you define the bullet (ballistic coefficient, mass and MV), the environmental conditions where you shoot (temperature, altitude, humidity as well as wind condition), how you zero and your scope is set up (distance, whether you zero above the bull a certain amount, height of the scope cl above bore cl) and then using this data you can calculate bullet drop and wind deflection for that particular combination.

If you use boat tail type bullets you will want to use the G7 BC for those since it is more accurate than the G1 BC. The only issue with that is that only Berger provides G7 BC's for their bullets. If you want to know more, then you have to get yourself a copy of Bryan Litz book "Applied Ballistics for Long Range Shooting" AB for Long Range Shooting
Bryan tested many bullets from all different manufacturers and provides independently verified data including the G7 BC's. Well worth the investment.
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