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#5601346 - 02/15/15 09:36 PM Chronograph and Dope Chart
Gone to Texas Offline
Veteran Tracker

Registered: 07/05/13
Posts: 2346
Loc: Hurst
I have purchased an MRAD scope and just trying to understand DOPE and everything.

I use the Vortex LRBC tool to calculate ballistics. I just guess with the velocity when inputting the information.

My question is, if I buy a chronograph, shoot some hand loads and find my true velocity, will the DOPE chart provided be accurate?
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#5601363 - 02/15/15 09:50 PM Re: Chronograph and Dope Chart [Re: Gone to Texas]
kmon1 Offline
junior

Registered: 09/27/06
Posts: 20289
Loc: Texas
Dope chart will only be as accurate as the information you feed it. Without true velocity, BC, sight height, altitude, temp, wind, barometric pressure... being input into the calculator you will not get the best dope to match your loads.

Best dope comes from actual field shooting. The calculator only gets you so close then tweek from actual field data. I prefer to shoot across a chronograph then calculate from there, from those calculations verify by shooting and adjust the dope from there.


I know that sounds like a lot of work and it is, but then again is shooting work? Plus the more you shoot the easier those longer shots become, and the more you can trust your dope.
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#5601693 - 02/16/15 08:16 AM Re: Chronograph and Dope Chart [Re: Gone to Texas]
FiremanJG Offline
THF Celebrity

Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
Good data in yeilds good data out. It can even be done without a chronograph if you have enough experience you know about how fast the bullet will be leaving. Make adjustments as necessary. Every shooter that comes out doesn't know their true MV and I make an educated guess even though I have a chronograph. Get a solid zero at 100, I write down calculated trajectory and off we go. About 300 yards is where there may be a descrepency. If I see the bullet falling more or less than calculated I will tell you your adjustments as we go. I write down actual DOPE on a second column. Then we'll go back into the calculator and adjust MV as necessary to make calculated trajectory match true DOPE (Data On Previous Engagement) On the top of the page I write down the environmental conditions when the DOPE was obtained. You leave with all that data.

So what I'm saying is if you'd just schedule a day you've already paid for all of this will come together. All you need is ammo that will hold and inch or better at 100 and about 80 rounds. I'll take it from there.
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#5602312 - 02/16/15 12:56 PM Re: Chronograph and Dope Chart [Re: Gone to Texas]
blackcoal Online   content
THF Trophy Hunter

Registered: 01/19/12
Posts: 7565
Loc: 60 Mi North of DFW
Chronographs can be purchased relatively cheap, $95 plus new and used are even cheaper. Naturally you can spend more, just like with scopes and reloading equipment.

Like stated above, GIGO.
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#5602769 - 02/16/15 04:18 PM Re: Chronograph and Dope Chart [Re: Gone to Texas]
Capt Craig Offline
Bird Dog

Registered: 08/23/11
Posts: 339
Loc: Corsicana, Texas
I shoot through the chrono and post averages and then work on a data sheet. I build an estimation DOPE sheet and take it to the range. The real accuracy data is gathered by shooting at actual distances and adjusting the DOPE to the actual points of impact and then creating a yardage sheet based off the actual POI. Depending on the range you are shooting, You will have to adjust for spin drift as well on your DOPE.
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#5602973 - 02/16/15 06:08 PM Re: Chronograph and Dope Chart [Re: Capt Craig]
FiremanJG Offline
THF Celebrity

Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
Originally Posted By: Capt Craig
You will have to adjust for spin drift as well on your DOPE.


Extremely rare occurence.
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#5603871 - 02/17/15 07:18 AM Re: Chronograph and Dope Chart [Re: Gone to Texas]
dee Offline
Extreme Tracker

Registered: 04/10/10
Posts: 4664
Loc: Red River way
Usually 100yd zero then groups at 300 and 1000 can give you a good dope chart for starting point. From there I true velocity provided I have a litz bc to go off of.
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#5613774 - 02/22/15 07:16 PM Re: Chronograph and Dope Chart [Re: Gone to Texas]
ChadTRG42 Online   happy
THF Trophy Hunter

Registered: 09/16/09
Posts: 9413
Loc: Lewisville, TX
I can figure out the velocity knowing the true BC of the bullet along with my field dope with a solid 100 yard zero. I need a 100 yard zero and to shoot out to about 600 yards.

But, if you run the estimated velocity with the true BC (Litz numbers), you can make you a dope chart that will get you close that you can fine tune in the field. It's not hard.
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