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Posted: 11/22/2018 10:09:19 AM EDT
I see a lot of bullet drop compensation computations but cant recall seeing a bullet rise computation.

With gravity being less effective at really high altitudes above sea level (10k' or more), I would think that we should have a book to help shooters account for this.
Link Posted: 11/22/2018 10:10:46 AM EDT
[#1]
Gravity is always working so bullets are always falling. They don’t rise.
Link Posted: 11/22/2018 10:12:09 AM EDT
[#2]
Is the bullet on a treadmill?
Link Posted: 11/22/2018 10:12:20 AM EDT
[#3]
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Quoted:
Gravity is always working so bullets are always falling. They don’t rise.
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So how do they shoot down airplanes?
Link Posted: 11/22/2018 10:13:39 AM EDT
[#4]
Space shuttle door gunners have this info.  If it's not classified, I'm sure one would be glad to send you a copy.
Link Posted: 11/22/2018 10:14:10 AM EDT
[#5]
First reply nailed it.  There is less air friction at higher elevations, but very little difference in the pull of gravity.
Link Posted: 11/22/2018 10:15:07 AM EDT
[#6]
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Quoted:
First reply nailed it.  There is less air friction at higher elevations, but very little difference in the pull of gravity.
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Link Posted: 11/22/2018 10:26:45 AM EDT
[#7]
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Quoted:

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Do you even physics? Acceleration due to gravity is a constant.
Link Posted: 11/22/2018 10:28:44 AM EDT
[#8]
The Earth is flat.
Link Posted: 11/22/2018 10:29:12 AM EDT
[#9]
Post whore post. I want to see how this evolves into flat earth logic.
Link Posted: 11/22/2018 10:31:25 AM EDT
[#10]
Link Posted: 11/22/2018 10:32:04 AM EDT
[#11]
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The Earth is flat.
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For this exercise we will assume so.
Link Posted: 11/22/2018 10:32:36 AM EDT
[#12]
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Quoted:

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9.8 m/sec^2

Is the same. 10k isn't enough distance to even measure any difference in Gravity. In fact, the mass of the mountain you are on would offset any difference in Gravity, and it might even be slightly higher.

Air density and temperature have more of an impact.
Link Posted: 11/22/2018 10:32:58 AM EDT
[#13]
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Quoted:
Do you even physics? Acceleration due to gravity is a constant.
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Quoted:
Quoted:

Do you even physics? Acceleration due to gravity is a constant.
Im giving you a double



What happens in real life does not always correlate to what the guy in the wheelchair tells us it is
Link Posted: 11/22/2018 10:33:03 AM EDT
[#14]
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Quoted:
Post whore post. I want to see how this evolves into flat earth logic.
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28 seconds too late!
Link Posted: 11/22/2018 10:33:23 AM EDT
[#15]
Are you shooting with, our against the rotation of the earth?
Link Posted: 11/22/2018 10:33:30 AM EDT
[#16]
Quoted:
With gravity being less effective at really high altitudes above sea level (10k' or more)
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Uh, no.
Link Posted: 11/22/2018 10:34:26 AM EDT
[#17]
Link Posted: 11/22/2018 10:35:14 AM EDT
[#18]
Muh thuddy thuddy will cut thru trees, don’t need to account for squat
Link Posted: 11/22/2018 10:35:22 AM EDT
[#19]
God has a magnet
Link Posted: 11/22/2018 10:36:02 AM EDT
[#20]
Discussion ForumsJump to Quoted PostQuote History
Quoted:

Im giving you a double



What happens in real life does not always correlate to what the guy in the wheelchair tells us it is
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Keep going. We're enjoying this.
Link Posted: 11/22/2018 10:36:02 AM EDT
[#21]
Discussion ForumsJump to Quoted PostQuote History
Quoted:

Im giving you a double



What happens in real life does not always correlate to what the guy in the wheelchair tells us it is
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Care to explain?
Link Posted: 11/22/2018 10:36:36 AM EDT
[#22]
Is the shooter on a treadmill?

Link Posted: 11/22/2018 10:37:18 AM EDT
[#23]
Holy shit, why just yesterday I was at 11,000 feet scoping big rams and thought ....
Link Posted: 11/22/2018 10:37:55 AM EDT
[#24]
Discussion ForumsJump to Quoted PostQuote History
Quoted:

Im giving you a double



What happens in real life does not always correlate to what the guy in the wheelchair tells us it is
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Don’t you have mice to masturbate? You should stick with to that.
Link Posted: 11/22/2018 10:38:36 AM EDT
[#25]
Acceleration of gravity does vary a little at different locations on the earth, something like 32.0 ft/sec/sec to 32.4 ft/sec/sec.

But the thinner air of higher elevation should make a more noticeable difference.  The bullet will lose less velocity as it travels because of less air molecules it has to push through.
Link Posted: 11/22/2018 10:38:41 AM EDT
[#26]
The guy in the wheelchair? I think you are looking for the guy who got hit in the head by an apple.
Link Posted: 11/22/2018 10:39:03 AM EDT
[#27]
Transition of the moon over its ecliptic?

Aliens?

Shooter flapping too much?

Link Posted: 11/22/2018 10:40:48 AM EDT
[#28]
Discussion ForumsJump to Quoted PostQuote History
Quoted:

Do you even physics? Acceleration due to gravity is a constant.
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Actually it isn't
Link Posted: 11/22/2018 10:41:49 AM EDT
[#29]
Discussion ForumsJump to Quoted PostQuote History
Quoted:

Im giving you a double



What happens in real life does not always correlate to what the guy in the wheelchair tells us it is
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What happens in real life and why YOU think it happens are two different things.

Bullets will hit slightly higher, but it has zero to do with gravity.
Link Posted: 11/22/2018 10:42:04 AM EDT
[#30]
It’s cold at elevation.

Bullets are hot out of the barrel.

Heat rises.



Link Posted: 11/22/2018 10:42:08 AM EDT
[#31]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Don’t you have mice to masturbate? You should stick with to that.
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Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:

Im giving you a double



What happens in real life does not always correlate to what the guy in the wheelchair tells us it is
Don’t you have mice to masturbate? You should stick with to that.
Wut?
Link Posted: 11/22/2018 10:43:53 AM EDT
[#32]
While 10,000 feet makes no difference on ballistics as far as gravity is concerned it makes you wonder about the ballistics in zero g.

If you shoot a bullet in space would it have a flat trajectory?
Link Posted: 11/22/2018 10:44:59 AM EDT
[#33]
This thread is turning into gold.  OP should post more so I can laugh more.
Link Posted: 11/22/2018 10:45:27 AM EDT
[#34]
Altitude doesn't change it much at all, shooting angle is a different story though.
Link Posted: 11/22/2018 10:45:46 AM EDT
[#35]
Discussion ForumsJump to Quoted PostQuote History
Quoted:

Im giving you a double



What happens in real life does not always correlate to what the guy in the wheelchair tells us it is
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g (at altitude) = 9.8 * 6371^2/(altitude+6371)^2
Link Posted: 11/22/2018 10:46:11 AM EDT
[#36]
Depends if the rifling is left or right hand twist.
Link Posted: 11/22/2018 10:46:45 AM EDT
[#37]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
While 10,000 feet makes no difference on ballistics as far as gravity is concerned it makes you wonder about the ballistics in zero g.

If you shoot a bullet in space would it have a flat trajectory?
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Yes, unless you were within microgravity, in which case it would be affected slightly. A bullet fired in orbit probably (I'm not going to even try to do the math) doesn't have enough delta V to change orbits, so it will be in a curved path around the earth.
Link Posted: 11/22/2018 10:48:47 AM EDT
[#38]
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Quoted:

Im giving you a double



What happens in real life does not always correlate to what the guy in the wheelchair tells us it is
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Come on man.  They buy you books, send you to school.....do you just not give a damn?
Link Posted: 11/22/2018 10:49:01 AM EDT
[#39]
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Even at the altitude of the ISS they are under about 85% of Earth gravity.
Link Posted: 11/22/2018 10:49:30 AM EDT
[#40]
Link Posted: 11/22/2018 10:50:08 AM EDT
[#41]
Discussion ForumsJump to Quoted PostQuote History
Quoted:

g (at altitude) = 9.8 * 6371^2/(altitude+6371)^2
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Altitude and being on a mountain are two different things. The mountain has mass. You would really need to include the mass in the equation to do it right.
So you'd need to do the whole square of the distances and gravitational constant calculation

Again air density has more impact than any gravity difference.
Link Posted: 11/22/2018 10:51:55 AM EDT
[#42]
He probably saw one of those Earth gravity charts with the pretty colors but failed to notice the difference is in the hundredths of m/s2.

And actually at higher elevations you have more mass beneath you so there is MORE gravity....
Link Posted: 11/22/2018 10:52:06 AM EDT
[#43]
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Uh, no.
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Quoted:
With gravity being less effective at really high altitudes above sea level (10k' or more)
Uh, no.
Actually it is. I worked with a guy who was a official with in the fcsa and he had a chunk of a engine connecting rod he used as a calibration weight for their scales when they checked rifle weights. It wasn't much but there was a difference between sea level and Raton, NM where they did some matches.

I don't think it's significant enough to be applied to what the op is talking about though.
Link Posted: 11/22/2018 10:52:10 AM EDT
[#44]
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Quoted:

g (at altitude) = 9.8 * 6371^2/(altitude+6371)^2
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Which is less than 1/10th of 1% at altitudes available on this planet.

So lets just call it "constant" ok?

Frickin' physicists are always trying to distribute their useless, negligible minutia.
Link Posted: 11/22/2018 10:53:33 AM EDT
[#45]
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Quoted:
First reply nailed it.  There is less air friction at higher elevations, but very little difference in the pull of gravity.
The bullet NEVER rises above the bore axis EVER.

The bore axis can cross the sight axis but that is factor of sight alignment.
Link Posted: 11/22/2018 10:54:59 AM EDT
[#46]
Oh boy.
Link Posted: 11/22/2018 10:55:37 AM EDT
[#47]
Discussion ForumsJump to Quoted PostQuote History
Quoted:

Altitude and being on a mountain are two different things. The mountain has mass. You would really need to include the mass in the equation to do it right.
So you'd need to do the whole square of the distances and gravitational constant calculation

Again air density has more impact than any gravity difference.
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Agree, but it depends of the situation really. If you're shooting from one peak to another across a sea level ridge the simple method using k would work fine.

I do agree with your second point and would more than likely make a sea level chart, then go shoot at altitude and see the difference and find the ratio and adjust accordingly.
Link Posted: 11/22/2018 10:56:03 AM EDT
[#48]
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Oh boy.
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I know right

This is common knowledge
Link Posted: 11/22/2018 10:56:19 AM EDT
[#49]
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Quoted:

Which is less than 1/10th of 1% at altitudes available on this planet.

So lets just call it "constant" ok?

Frickin' physicists are always trying to distribute their useless, negligible minutia.
View Quote
It is negligible, but op asked a question.
Link Posted: 11/22/2018 10:57:14 AM EDT
[#50]
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Quoted:

Do you even physics? Acceleration due to gravity is a constant.
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Apparently you dont physics
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