Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Equipment Discussions


Reply

Ian, I need your help, please?

 
LinkBack Thread Tools Display Modes
  #15  
Old 10-09-2004, 01:46 AM
 
Posts: n/a
Re: Ian, I need your help, please?

Warren-- Copy the tables in S1's post on A.R. Tactical. The whole proces is there, including the correction table in 5 degree increments, and the equations.
http://artactical.com/eve/ubb.x?a=tp...05&m=859609536

[img]images/icons/wink.gif[/img]
Reply With Quote
  #16  
Old 10-09-2004, 07:23 AM
Silver Member
 
Join Date: Mar 2002
Location: Georgia
Posts: 106
Re: Ian, I need your help, please?

Antslayer, I`ve already copied those, but the shot angles are in 10 degree incriments up to 40 degrees.
Do you think splitting the difference would be close enough?
__________________
wb
Reply With Quote
  #17  
Old 10-09-2004, 03:51 PM
 
Posts: n/a
Re: Ian, I need your help, please?

Warren-- This should fill in some of the blanks, I hope this helps.

Correction factors:

5 degrees = .0038

15 degrees = .0341

25 degrees = .0937

35 degrees = .1809

85 degrees = .9128

90 degrees = 1.0

As you may see, the changes are small but become more and more critical as range increases. I admire your determination to get it right the first time. You will get a lot of advice from people about how to do things. What most of these advice givers do not understand is the relationship of multiple errors and how several small errors will add up to a big MISS! You may have read a recent post about mil radian spacing, and one advice giver wrote that using an 'estimate' would suffice. Try to imagine a simple shot from 1200 yards with a 30 degree incline and a 4.7 percent ranging error, now....compound that error with the error from using a ACI and the wrong inclination formula. Both errors could sum and cause you to shoot low. Which will result in you shooting so FAR UNDER the target you will be left scratching your head. This is why guys wind up taking "spotter shots". Their methods have these little flaws in them, and they can not understand the interaction of all of the small errors. OOPS....MISSED AGAIN! [img]images/icons/shocked.gif[/img] Not all errors sum, they can cancel eachother out occasionally, and you could get lucky.....does everybody FEEEEEEEEEL LUCKY? I think in the real world, every one feels Mr. Murphy's presence. What Teo said about the wind is true, but you can learn to deal with it. One shot kills at 1,000 yards are common with todays technology, even in mountainous terrain. We hunted in Utah last year, and had a shooting contest in between Elk and Mule deer season. One shot at an Elk sized torso at 500 yards, if you hit, you are still in, if you miss, you are out. Out of 12 guys in the contest, 3 made it to 900 yards with hits at that distance. 1 of the guys had no formal training, just a car salesman from Salt Lake. The two with training and experience went to 1400 yards, and the winner went to 1500, and could have gone further, just ran out of time.

P.S. The error correction factor for any angle is 1.0 - the angle's cosine.

Keep shooting with precision, and keep thinking with precision, you will shoot farther and straighter than most. I think CrowMag says it best.....

"If you think something is not possible move out of the way so the ones that are doing it can "

[ 10-09-2004: Message edited by: Antslayer ]
Reply With Quote
  #18  
Old 10-09-2004, 08:41 PM
Silver Member
 
Join Date: Mar 2002
Location: Georgia
Posts: 106
Re: Ian, I need your help, please?

Antslayer, as you said, ocassionally Murphy`s law does get us all, but knowing how to do something and not knowing makes all the difference in the world. The more we can learn about what we`re doing, the more we can do with it and I just love that.
As already stated, I`m a newby to this longrange game in mountainous terrain and I very much appreciate all of the replies. I can now get started with more confidence.

thanks again, Warren
__________________
wb
Reply With Quote
  #19  
Old 10-27-2004, 07:21 PM
Junior Member
 
Join Date: Jun 2004
Location: New Zealand
Posts: 12
Re: Ian, I need your help, please?

Hi Warren. This may be a bit late for your trip but others may find this useful. The data below can be used to find the horizontal distance to the target from the incline angle and slope (measured) distance.

0 deg (horiz.), multiply slope distance by 1
5 deg, multiply slope distance by 1
10 deg, multiply slope distance by 0.98
15 deg, multiply slope distance by 0.97
20 deg, multiply slope distance by 0.94
25 deg, multiply slope distance by 0.91
30 deg, multiply slope distance by 0.87
35 deg, multiply slope distance by 0.82
40 deg, multiply slope distance by 0.77
45 deg, multiply slope distance by 0.71
50 deg, multiply slope distance by 0.64
55 deg, multiply slope distance by 0.57
60 deg, multiply slope distance by 0.5

A useful instrument for measuring angles is a clinometer. Some of the Silva compasses have these built in, while Brunton makes one called the CM Clinomaster and Suunto also makes a good one called the PM-5/360 PC. The used Suunto ones sell on e-bay for about $50.

Hope this helps. I was wondering when that engineering degree would come in handy.
Reply With Quote
  #20  
Old 10-31-2004, 04:23 PM
Silver Member
 
Join Date: Mar 2002
Location: Georgia
Posts: 106
Re: Ian, I need your help, please?

Thanks Scol.
Yea it`s a little late for the trip, but it`ll be helpfull information in the future.

thanks a lot, Warren
__________________
wb
Reply With Quote
  #21  
Old 11-02-2004, 09:29 AM
700 700 is offline
Silver Member
 
Join Date: Jun 2002
Location: Ireland
Posts: 138
Re: Ian, I need your help, please?

Warren

If you give me any ballistic info that you might have to hand, I can make a ballistic chart for you.

Do you have any idea what altitude you will be shooting at in the rockies.

I will email you sample copy.

The Silva/Bruton Horse Shoe Compass with Inclinometer is a nice piece of kit.

Rgds

700
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Current Poll
Do you archery hunt for elk?
YES - 29.52%
49 Votes
NO - 55.42%
92 Votes
Not yet, but I plan to. - 15.06%
25 Votes
Total Votes: 166
You may not vote on this poll.

All times are GMT -5. The time now is 05:02 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC