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Shooting up hill/ Shooting down hill?

 
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  #29  
Old 04-17-2011, 11:57 AM
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Re: Shooting up hill/ Shooting down hill?

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BOB, dont feel bad about the misspelled name. it could have been worse.
The knowledge base of shooting uphill and downhill has constantly improved in the nearly decade this forum has existed. I merely hate to see an internet wonder dispensing advice that we have discredited long ago.

And where we are at the moment is exactly as you said

Quote:
my engineer grandson simply holds his ipod next to the barrel and has an answer in seconds. usually while im looking for my chart.
No one who regularly kills animals at 1K and beyond will accept anything that looks like a one MOA error yet the internet wonder concludes.

Quote:
most simplify it to cosine x distance others use thier drop tables for the distance to target and use cosine x drop the result is fairly close to each other less than 1 minute of angle.
That is an unacceptable error bracket for any single component of long range shooting when there are so many other sources of error that have to be accounted for.
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  #30  
Old 04-17-2011, 01:02 PM
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Re: Shooting up hill/ Shooting down hill?

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Originally Posted by rcdinaz View Post
Load thanks for the cannonball example, I found some similar analogies to satellite flight/launch and a golf ball example. I think I am on the same page and looking at the Sierra link (below) we can still pretty much assume gravity is a negligible based on it being constant (9.8m/s). I think I was confused more by semantics... time of flight vs gravity. As you mentioned there is some difference in the theoretical realm especially at extreme angles of 90 deg & 180 deg but am I correct that for trajectory calculations most will use it is not really a factor?

Sorry to beat a dead horse on this still trying to make sure I have a proper grasp on this topic. I am rally looking at this trying to determine at what ranges a rifle mounted angle indicator starts to reach its limit on usefulness and if there are any possible errors/assumptions to be aware of in most of the ballistics programs out there.

It has been over 20 years since I had to actually do the math and the trig and calc equation make my head hurt.


exterior ballistics
when you do the math on the figure showen on 5.2-1 it shows less drop than either the dropXcosine and distanceXcosine

from sierra
Increase in
Elevation Angle Bullet Path Height
+/- 5 degrees .004 d inches
+/- 10 .015 d
+/- 15 .034 d
+/- 20 .060 d
+/- 25 .094 d
+/- 30 .134 d
+/- 35 .181 d
+/- 40 .234 d
+/- 45 .293 d
+/- 50 .357 d
+/- 55 .426 d
+/- 60 .500 d



which is (drop in inches x d)=X (drop in inches-X=adjusted drop)

three differnet equations three seperate sets of #s (this one is about 1/2 minute less than drop x cosine) blob would call this one unacceptble also.
bottom line just get out and shoot. without verifying all the math in the world will still end up in a miss

i use the ipod/bullet flight fte method myself it works however yet again isn't perfect.

Last edited by load; 04-17-2011 at 01:10 PM.
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  #31  
Old 04-17-2011, 03:45 PM
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Re: Shooting up hill/ Shooting down hill?

Now that you have finally figured it out, do the rest of the forum members a favor and don't give poor quality advice any more.
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  #32  
Old 04-17-2011, 04:43 PM
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Join Date: Feb 2011
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Re: Shooting up hill/ Shooting down hill?

okay, use the math; verify with practice and records; adjust to real world results... got it!

I will keep studying, I am also using Shooter for Android which seems to work well and is a bargain at $10.
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  #33  
Old 04-17-2011, 05:57 PM
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Location: South of Canada and North of Wyoming
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Re: Shooting up hill/ Shooting down hill?

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Quote:
Originally Posted by kc View Post
If a hunter was in a position to make a clean shot at a big fat White tail Deer that is standing broad side, and is up hill or in the same position but down hill, how should that hunter aim?
The hunter also knows the distance..
In my whitetail hunitng experience you will not find them very often in places where angle shooting is a factor. Now that we have that out of the way if you're talking mountain mulies, elk, sheep, goats, etc., just use a good balistics program that takes ALL the factor's into consideration including scope height.

Another thing you want to consider, is the bullets path through the animal at extreme angles. i.e., if you're shooting downhill, and you aim (corrected for angle) for the animals actual mid body (vs apparent mid body), your bullet will travel through the lower part of the animal and may result in a single lung vs double lung. Just something else to consider.

-Mark
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  #34  
Old 04-17-2011, 05:58 PM
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Re: Shooting up hill/ Shooting down hill?

again bob the typical "riflemans rule" is not my math, nor MY bad advise. it is the "typical" accepted idea thats taught across the country. all three formulas are close and NONE are exact. its the idea that needs to be understood all calculations should be verified and logged.
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  #35  
Old 04-17-2011, 06:07 PM
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Re: Shooting up hill/ Shooting down hill?

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all calculations should be verified
Shawn Carlock did that for us. His ability with a rifle at extreme ranges is phenomenal. That is why people like Berger and Nightforce/Exbal ask him to test their theories and products.
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