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DROP CHART . When EXBAL FAILS ???

 
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Old 12-28-2012, 09:47 PM
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DROP CHART . When EXBAL FAILS ???

How do you guys go about creating an accurate or average hard copy drop chart ? I see some of you have them taped to your rifle stocks in some photos ? I usually enter real world conditions with my Kestrel as I know elevation baro, temp,RH changes from location to location and day to day . So how do you get say a rough estimate as accurate as possible ? Thanks any help will be appreciated ..........
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Old 12-28-2012, 10:54 PM
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Re: DROP CHART . When EXBAL FAILS ???

I use my most likely conditions during hunting season. Where I am its usually between -5*C and +2*C and I usually am hunting between 2500 and 3500 ft. with a R/humidity of 30-50%.
My conditions would be 0*C,3000 ft. and 40% RH. baro around 28.8

put that on an excel spreadsheet and away you go. Then make a correction in MOA per 10*C and for every 1000 ft. I also have a picture of my reticule and the drops for that on the same sheet.

I will only use a drop sheet to 700 yards, after that I'm only comfortable with a PDA/phone.

Oh, if its not gonna get taped to your rifle, carry like 6 of em throughout your pack.
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Old 12-28-2012, 11:12 PM
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Re: DROP CHART . When EXBAL FAILS ???

I calc a corrected altitude diff per 1000 and put that next to windage at 10mph and do it in my head out to 1200 on my charts. Prefer a phone or palm past 800 but I just have a feel for it also kinda like windage.
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Old 12-28-2012, 11:27 PM
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Re: DROP CHART . When EXBAL FAILS ???

This is how I did my drop chart for my Vortex Custom Turret which is dead nuts accurate as far as it will adjust.

Drop chart. - Georgia Outdoor News Forum

This is what happened the first time I tested the custom turret.

Testing new Vortex custom turret. - Georgia Outdoor News Forum

gt40

PS: You might consider a custom turret for your scope. - - - - - - - - - -
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Old 12-29-2012, 12:01 AM
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Re: DROP CHART . When EXBAL FAILS ???

Quote:
Originally Posted by joseph View Post
This is how I did my drop chart for my Vortex Custom Turret which is dead nuts accurate as far as it will adjust.

Drop chart. - Georgia Outdoor News Forum

This is what happened the first time I tested the custom turret.

Testing new Vortex custom turret. - Georgia Outdoor News Forum

gt40

PS: You might consider a custom turret for your scope. - - - - - - - - - -
Do you fudge the corrected altitude with that turret? If your conditions are way off how do you allow for it? I was thinking of simplifying with a turret and a fudge factor for various conditions is this what you are doing to account for varying corrected altitudes?
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Old 12-29-2012, 02:47 AM
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Re: DROP CHART . When EXBAL FAILS ???

Quote:
Originally Posted by toddc View Post
Do you fudge the corrected altitude with that turret? If your conditions are way off how do you allow for it? I was thinking of simplifying with a turret and a fudge factor for various conditions is this what you are doing to account for varying corrected altitudes?

I did the drop chart where I live in North Georgia ( el. 800 ft. ) and when I ordered the custom turret I told Vortex I wanted it for hunting in North East Wyoming and they adjusted the altitude to 4,500 feet and everything else to match the arc. I wanted the turret to be true to follow the arc of my bullet as it goes down range. Vortex adjusted all the figures for the computer so the turret would be right on the money. They did a perfect job because when I was at a 2,000 yd. range up there I shot from 200 yds. all the way out to 900 yds. which is as far as my turret is marked for. It was dead center at every 100 yd, interval out to 900 yds.

Back here in Georgia the arc is the same out to 400 yds. Past there the turret will probably be farther off because of the difference in elevation.

joseph

PS: When I shot 1,000 competition I had to count 108 MOA clicks up from my 200 yd. zero. which put me centered in the 1,000 yd. target. All three 5 shot groups would have hit in the boiler room of an antelope.
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Old 12-29-2012, 03:26 AM
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Re: DROP CHART . When EXBAL FAILS ???

Quote:
Originally Posted by bigbuck View Post
How do you guys go about creating an accurate or average hard copy drop chart ? I see some of you have them taped to your rifle stocks in some photos ? I usually enter real world conditions with my Kestrel as I know elevation baro, temp,RH changes from location to location and day to day . So how do you get say a rough estimate as accurate as possible ? Thanks any help will be appreciated ..........
Verify your drops and known ranges, and adjust your BC or velocity or both until you get a match on your calculator.

Print those drops.

If you can do it at different elevations conditions and make up multiple cards.

One thing you can count on with technology is that it's only likely to fail you when you need it the most so always have a backup plan.

As stated above if you go with custom turrets you can get them for different bullets, different elevations/conditions.

While we try to narrow the variables and unknowns as much as possible for precision with the high speed calibers we are shooting today combined with the high BC bullets a change in conditions (other than wind) usually isn't going to make or break you out to 1,000yds.

Beyond 600yds, life gets complicated but controllable, beyond 1,000yds, life gets extremely complicated so you want everything as exact as possible.
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