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#5435507 - 11/21/14 12:57 PM Long range shooting with ballistic calculators???
Tye Offline
Veteran Tracker

Registered: 01/18/07
Posts: 3395
Loc: Eastland county
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.
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Originally Posted By: AmoCuernos
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#5435521 - 11/21/14 01:02 PM Re: Long range shooting with ballistic calculators??? [Re: Tye]
dee Online   content
THF Trophy Hunter

Registered: 04/10/10
Posts: 5266
Loc: Red River way
I use Applied Ballistics. I try adjustments in velocity or go back and change the bc some. Who's bc numbers are you using.
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#5435537 - 11/21/14 01:12 PM Re: Long range shooting with ballistic calculators??? [Re: Tye]
Tye Offline
Veteran Tracker

Registered: 01/18/07
Posts: 3395
Loc: Eastland county
I just started using the ISnipe app. I'm using the Litz G7. Don't know if this is right or not
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Originally Posted By: AmoCuernos
If you shoot a young deer because a neighbor will shoot it, you are that neighbor.

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#5435548 - 11/21/14 01:18 PM Re: Long range shooting with ballistic calculators??? [Re: Tye]
dee Online   content
THF Trophy Hunter

Registered: 04/10/10
Posts: 5266
Loc: Red River way
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.
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"A vote is like a rifle; it's usefulness depends on the character of the user" Theodore Roosevelt

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#5435550 - 11/21/14 01:20 PM Re: Long range shooting with ballistic calculators??? [Re: Tye]
FiremanJG Online   content
THF Celebrity

Registered: 12/16/08
Posts: 24036
Loc: Wolfe City, TX
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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#5435556 - 11/21/14 01:24 PM Re: Long range shooting with ballistic calculators??? [Re: Tye]
FiremanJG Online   content
THF Celebrity

Registered: 12/16/08
Posts: 24036
Loc: Wolfe City, TX
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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#5435604 - 11/21/14 02:06 PM Re: Long range shooting with ballistic calculators??? [Re: Tye]
TRoberts Offline
Veteran Tracker

Registered: 06/18/12
Posts: 2486
Loc: Whitehouse, TX
X2 on jbmballistics.com Thats a great tool for the basic numbers
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Originally Posted By: Sneaky
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#5443868 - 11/26/14 12:11 AM Re: Long range shooting with ballistic calculators??? [Re: Tye]
westexhunt Online   content
Tracker

Registered: 11/05/12
Posts: 898
Loc: San Angelo
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.

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#5443998 - 11/26/14 07:25 AM Re: Long range shooting with ballistic calculators??? [Re: Tye]
jeff1383 Offline
Tracker

Registered: 05/19/11
Posts: 873
Loc: Frisco
Sterlok Pro is also a good app. Is your app capable to do a trajectory verification?

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#5444031 - 11/26/14 07:42 AM Re: Long range shooting with ballistic calculators??? [Re: Tye]
jeffbird Offline


Registered: 03/09/09
Posts: 2844
At longer ranges, correction for barometric pressure or density altitude is important.

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#5444150 - 11/26/14 08:43 AM Re: Long range shooting with ballistic calculators??? [Re: Tye]
kmon1 Online   content
junior

Registered: 09/27/06
Posts: 22773
Loc: Texas
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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