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You Only Need to Know This If You Shoot Past 700 Yards!

 
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  #22  
Old 02-18-2013, 01:55 PM
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Re: You Only Need to Know This If You Shoot Past 700 Yards!

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Originally Posted by phorwath View Post
Doppler radar is used to accurately identify bullet velocity throughout travel downrange. Accurate BC values can then be calculated based on these known accurate bullet velocities at different known ranges. Accurate BC values can also be calculated based on bullet time-of-bullet-flight measurements collected over long yardages, either by light sensing chronographs of acoustic sensing chronographs. Good ballistics programs can use these accurate BC values to determine accurate dope for shots under variable and changing environmental conditions, locations, directions of fire, and slopes that can be encountered while hunting at any location, altitude, and conditions of fire. It's difficult and tedious to prepare for these variable and changing factors some hunters encounter by attempting to use printed range cards developed by measuring drops over extended distance at a practice range. Range cards are great for hunting at the same location where you collected the measured drops. But they won't be nearly as adaptable and accurate after relocating to a hunting location 500 miles away and 6000 feet higher in elevation, while engaging a game animal up or down a 25 degree sloped mountainside. Thus the advantage of a good ballistics program, loaded with an accurate BC value and muzzle velocity for the bullet in use.

Confirming corrective dope for the actual shot on game is a great tactic if a hunter is setting up to ambush game at a specific location. One can then set up a large target where the game is expected to appear and take practice shots until the rifle is zeroed dead-nutz on before the game animal walks over to the location where the target had been previously set up. On my hunts (mountainous terrain), I can't often predict when or where I'll be setting up for the shot. My ballistics program is able to provide accurate dope no matter where the shot presents, provided I've entered accurate data, including accurate BC values.
Very well stated Paul! This is where I am right now. I'm trying to decide whether to put my $$$$ into ballistic programs "this year", or just spend more time fine tuning at my elk hunting stand and look to expand down the road? I have too many places to spend my $$$$.......Rich
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  #23  
Old 02-18-2013, 10:30 PM
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Re: You Only Need to Know This If You Shoot Past 700 Yards!

Phorwath old buddy, glad you're still alive.

Take care of your self and your loved ones!

Regards,

Javier Moncada (Eaglet)
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Last edited by Eaglet; 02-18-2013 at 10:32 PM. Reason: I love it
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  #24  
Old 02-19-2013, 01:27 AM
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Re: You Only Need to Know This If You Shoot Past 700 Yards!

After ones got all the ballistics figured out and zeros for every yard of range from here to eternity, judging the sight correction for cross winds is what's left.

Do you know how to adjust your scope's focus to see the mirage (heat waves) wrinkling across the field of view and estimate its speed across the bullet's path at different distances down range?

Which range band of wind has the greatest effect on drift; winds closest to you, half way to the target or closest to the target?

With a foot or more of drift per mph of consistant cross wind speed at ranges past 1000 yards, you'll need to be able to judge cross wind speeds very accurate. And the wind never blows across the line of sight uniformly all the way to the target. To say nothing of the fact that for a given wind speed across the ground, it gets faster for each foot above ground. How much faster depends on the terrain it's blowing across; less per foot above flat, smooth ground; more with vegitation such as brush and trees as well as other obstructions. Which means the wind's blowing faster on the bullet when its at its highest point in its trajectory. Then you'll also need to correct for the wind angle relative to the line of sight.

Getting zero's is about 20% of long range first shot hit success. The rest of it's correcting for crosswinds.
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  #25  
Old 02-19-2013, 02:01 AM
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Re: You Only Need to Know This If You Shoot Past 700 Yards!

Geez Bart is that it? You make it all sound so simple! J/K Knowing what you just said is true is what fascinates me about long range shooting. Seeing others finding success at it reminds me it's possible but reading what you just wrote and having many learning experiences myself keeps me scratching my head.
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  #26  
Old 02-19-2013, 09:22 AM
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Re: You Only Need to Know This If You Shoot Past 700 Yards!

Shortpants, it's really that simple. . . . .

Especially when one considers the fact that decent bullets flying through the air at 1500 yards drop about 2 inches per horizontal yard of travel. So getting the range to within 5 yards of reality means you may not miss your point of aim by more than 10 inches. That's assuming all the other ballistic stuff corrected for is absolutely exact.

The hard part's remembering all this stuff when you need to use it.
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  #27  
Old 02-19-2013, 10:57 AM
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Re: You Only Need to Know This If You Shoot Past 700 Yards!

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Originally Posted by Eaglet View Post
Phorwath old buddy, glad you're still alive.

Take care of your self and your loved ones!

Regards,

Javier Moncada (Eaglet)
Thanks Javier, and the same to you. Glad to hear you're remaining active with your guns and gear, enjoying those long range shots, and putting CB1.0 to good use.

Paul
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