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Long range shooting with ballistic calculators??? #5435507 11/21/14 06:57 PM
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Tye Offline OP
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For those that use a ballistic calculator app, what do you change in the calculator to make it match "true statements" ? I got my 6.5 CM velocity this week. It was 2610 fps using hand loads with 140 grain Amax bullets. I noticed that the calculator is off by 2-3 tenths. Do y'all adjust the velocity to make the calculator match where your bullet impacts or scope heights off bore? I'm using the ISnipe app.


Originally Posted By: AmoCuernos
If you shoot a young deer because a neighbor will shoot it, you are that neighbor.
Re: Long range shooting with ballistic calculators??? [Re: Tye] #5435521 11/21/14 07:02 PM
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dee Offline
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I use Applied Ballistics. I try adjustments in velocity or go back and change the bc some. Who's bc numbers are you using.


"A vote is like a rifle; it's usefulness depends on the character of the user" Theodore Roosevelt
Re: Long range shooting with ballistic calculators??? [Re: Tye] #5435537 11/21/14 07:12 PM
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Tye Offline OP
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I just started using the ISnipe app. I'm using the Litz G7. Don't know if this is right or not


Originally Posted By: AmoCuernos
If you shoot a young deer because a neighbor will shoot it, you are that neighbor.
Re: Long range shooting with ballistic calculators??? [Re: Tye] #5435548 11/21/14 07:18 PM
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dee Offline
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That's one of the most accurate one's to use. Also might punch in your info into the berger twist calculator to make sure you are using your full bc.


"A vote is like a rifle; it's usefulness depends on the character of the user" Theodore Roosevelt
Re: Long range shooting with ballistic calculators??? [Re: Tye] #5435550 11/21/14 07:20 PM
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Adjusting velocity usually gives the best results. That is, provided you have a true BC, as opposed to Noslers inflated BCs, for instance. That is called "truing your DOPE".

I use "Shooter" $9.95 one time payment and well worth it. Though, no app is as good as a Kestrel weather meter with Horus Ballistics or Applied ballistics.


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Re: Long range shooting with ballistic calculators??? [Re: Tye] #5435556 11/21/14 07:24 PM
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Also use jbmballistics.com. Free and easy on a PC. Very accurate calculator. You can also copy the data, then past to an Excel file and print out a neat clean chart. I keep these for all rifles in the stock pack as a backup when batteries die or any other electronic failure. You can adjust barometric pressure on jbm to have various charts for given conditions. This usually isnt very needed uless you're shooting outside 500 with a .308 Win or .270, or outside 700 yards with your 6.5 Creedmoor. They tend to shoot consistent to those ranges in a broad spectrum of environmental conditions.


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Re: Long range shooting with ballistic calculators??? [Re: Tye] #5435604 11/21/14 08:06 PM
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X2 on jbmballistics.com Thats a great tool for the basic numbers


Originally Posted by Sneaky
He gave me plenty.
Re: Long range shooting with ballistic calculators??? [Re: Tye] #5443868 11/26/14 06:11 AM
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I use Shooter on my Iphone and Ipad. Limited experience but I have made hits at 850 with 308, 223, etc quickly using dials from Shooter.

Re: Long range shooting with ballistic calculators??? [Re: Tye] #5443998 11/26/14 01:25 PM
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Sterlok Pro is also a good app. Is your app capable to do a trajectory verification?

Re: Long range shooting with ballistic calculators??? [Re: Tye] #5444031 11/26/14 01:42 PM
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At longer ranges, correction for barometric pressure or density altitude is important.

Re: Long range shooting with ballistic calculators??? [Re: Tye] #5444150 11/26/14 02:43 PM
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kmon11 Offline
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There are some things that are easy to measure or get like scope height, velocity, temperature, altitude, barometric pressure...

BC on the other hand is a calculated value that varies some dependent on bullet form factor, velocity, twist rate, deformation when engraved by rifling..... The Berger twist rate calculator that Dee mentioned provides some good info, found out to expect 6% degradation in BC for the 6.5-284 with one of my pet loads for it.

I like to set as much of the measurable as I can then adjust the BC to match field data at 2 or more distances, the rest are pretty much on after that.

JBM is a good one, I have a couple others that have also worked well, one came with Quickloads and the other was a free download from Berger at one time.


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