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Shooting & Reloading - Mausers, Big Bores and others >> Big Bore Rifles
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Luckydog
.275 member


Reged: 27/02/08
Posts: 56
Loc: Huntin' In Colorado
Shooting Uphill Or Downhill
      #100184 - 24/03/08 11:52 PM

Can someone explain this to me? How much will it affect my shot? If your shooting uphill will you be high down hill low? I've always heard it can change your trajectory, I've just never heard how much, which way, and why.

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Tatume
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Reged: 09/06/07
Posts: 1091
Loc: Gloucester, Va USA
Re: Shooting Uphill Or Downhill [Re: Luckydog]
      #100187 - 25/03/08 12:37 AM

Quote:

Can someone explain this to me? How much will it affect my shot? If you're shooting uphill will you be high, down hill low? I've always heard it can change your trajectory, I've just never heard how much, which way, and why.



The current edition of the Sierra Reloading Manual has a through treatment of this question. If your interest is technical, here is where to find your answer.

If your interest is practical, then whether shooting uphill or downhill, the shot will go higher than expected. How much to compensate is the question. If the angle is less than 30 degrees or the distance is less than 400 yards, ignore it. The difference is too small to matter. If the angle is 30 degrees or more, AND the distance is 400 yards or more, and you have not practiced shooting under these conditions, get closer.

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gryphon
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Reged: 01/01/03
Posts: 5487
Loc: Sambar ground/Victoria/Austral...
Re: Shooting Uphill Or Downhill [Re: Tatume]
      #100205 - 25/03/08 03:47 AM

this will help you out cobber.

http://www.loadammo.com/Topics/April04.htm

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szihn
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Reged: 24/06/07
Posts: 2121
Loc: United States
Re: Shooting Uphill Or Downhill [Re: gryphon]
      #100209 - 25/03/08 04:32 AM

OK, Here's the explanation in a nut shell.

Gravity is a constant. It exerts pull on all objects in one direction. Straight towards the center of the earth.

Now. if you have a wind of constant speed at full value (let's say 90 degrees from the left going to the right) that wind is going to drive your bullet to the right. If you fire a bullet directly sideways of the wind, it has the greatest effect on that bullet.

If you shoot at a 45 degree angle to the wind we call it a "half value wind" because the wind is only exerting 1/2 of it's force to the side of the bullet. If we shoot at an 22.5 degree angle to the wind, it's a 1/4 value wind, and if we shoot directly away from the wind it's a zero value wind.

Gravity works the same way, for basically the same reason. If you are shooting down hill at 45 degrees, gravity is only effecting the bullet at that same 45 degree angle. Not at 90 degrees as it would be on the firing range.
Now, this is a bit oversimplified, because of other factors that come into play, (altitude, temp, humidity, ballistic characteristics of the bullet itself and so on) but this is the basic concept.

Edited by szihn (25/03/08 04:35 AM)

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Bramble
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Reged: 29/07/06
Posts: 950
Loc: England
Re: Shooting Uphill Or Downhill [Re: szihn]
      #100212 - 25/03/08 05:00 AM

Just to confuse the isue and make it harder for long range shooting.

If you shoot at a target inclined up hill or down hill, the bullet drop will only be for the horizontal range. However the effects of wind on the bullet will be for its entire flight distence as will its slowing due to air resistence.
So for a target 400 horizontal yds away at an elevation of 400yds gravety effects it for the equilivent of 400 yds but all other factors work for 565 yards which is the actual distence that the bullet travels.
So if you range an 400 yd uphill target at 565 yds and set a BDC scope for that range you will shoot high. It is not as far as the bullet is concerned 565 yds, however it is not 400 yds either :-(

I am not sure if that helps at all really

Regards

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JabaliHunter
.400 member


Reged: 16/05/07
Posts: 1958
Loc: England
Re: Shooting Uphill Or Downhill [Re: Bramble]
      #100215 - 25/03/08 06:56 AM

This is the best explanation that I have come across - courtesy of the Grand Slam Club
http://www.wildsheep.org/magazines/article_uphill_shooting.htm

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iqbal
resigned as a member


Reged: 05/02/03
Posts: 778
Loc: Karachi,Pakistan
Re: Shooting Uphill Or Downhill [Re: Luckydog]
      #100311 - 26/03/08 04:51 AM

All the reasons given above are technically correct but in a real hunting situation when the animal is in your sights and your heart is racing you do not have the time to consider all the reasons.I have memorised the word "SLOW" which stands for "shoot low" and according to my judgement of distance and angle I try to place the shot low when shooting above or below my line of sight.Any target over 45 degrees up or down I try to compensate.Minimum width of an animals chest is around 8 inches and an inch up or down will not make much difference.Thats how I go about it.

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Luckydog
.275 member


Reged: 27/02/08
Posts: 56
Loc: Huntin' In Colorado
Re: Shooting Uphill Or Downhill [Re: iqbal]
      #100340 - 26/03/08 09:21 AM

Thanks for all the info! I printed up both web sites explanations and will try and learn a little something.

--------------------
Make Sure You Vote, And Make Sure Your Friends Vote!!

When they outlaw guns...I'll be an outlaw! Reese

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Plains99
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Reged: 10/11/04
Posts: 225
Loc: Dodge City, Kansas, USA
Re: Shooting Uphill Or Downhill [Re: Luckydog]
      #100413 - 27/03/08 12:16 AM

I agree with Tatume. Unless the angle is steep and distance extended, I aim dead on and let the round's traits take care of it. I try to keep my big game shooting range distance limited to 200 yards and I don't worry about this element. I've hunted some very steep terrain and have not had poor results from this effect.

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DarylS
.700 member


Reged: 10/08/05
Posts: 27701
Loc: Beautiful British Columbia, Ca...
Re: Shooting Uphill Or Downhill [Re: Plains99]
      #100433 - 27/03/08 03:42 AM

With modern flat shooting rounds, angle must be very steel indeed to make much difference within normal hunting ranges.
; Shooting angle is just another or many reasons to limit game shots to 200 to 300 yards max.

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Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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