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# Altitude & Temperature Effects on a Bullet?

#1
03-03-2005, 03:44 PM
 Junior Member Join Date: Mar 2005 Posts: 4
Altitude & Temperature Effects on a Bullet?

I'm a Big Game hunter with a 30-06 and was wondering how much higher a bullet will shoot in higher altitude climates.

I normally sight the 30-06 with 165-gr. bullets in for 200 yards at 4,500 feet above sea level in Utah. This equates to 1.9" high at 100.

When I go hunting in the mountains, the altitude is about 8,000 feet, but a lot colder at 20*F versus 60*F when rifle was sighted in.

So, about how much higher would my bullet be (than 1.9" at 100 yards) with the thinner air at 8,000 feet?

Steve
#2
03-03-2005, 03:47 PM
 Gold Member Join Date: Dec 2004 Location: Black Hills,South Dakota Posts: 661
Re: Altitude & Temperature Effects on a Bullet?

At 100 or 200 yds its not worth woorying about.
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#3
03-03-2005, 03:52 PM
 Bronze Member Join Date: Aug 2004 Location: Arizona Mountains Posts: 50
Re: Altitude & Temperature Effects on a Bullet?

Steve

Go to the ballistics Forum and there is a free program where you can run all kinds of scenarios.
#4
03-03-2005, 06:46 PM
 Gold Member Join Date: Nov 2004 Posts: 878
Re: Altitude & Temperature Effects on a Bullet?

as ballistic posted before me, its really not a big differance.
even if you compare two extremes...

0 degrees vs 100degrees
0 ft elevation vs 8000 ft elevation
100% humidity vs 0% humidity

even if you zero on the left column, and shoot under the conditions on the right the differance only looks like this
100 .05
200 .39
300 1.43

So basically, under ordinary circumstances, unless you are talking 400+ yds (and usually a lot further than that) it dosn't matter.
#5
03-03-2005, 06:51 PM
 Platinum Member Join Date: May 2001 Posts: 2,377
Re: Altitude & Temperature Effects on a Bullet?

I'd agree with the assessment that there is no discernable difference at 100 to 200 yards.

Several years back I did a zero check and trajectory check at about 10,000ft as compared to my usual 600ft altitude. Not until I was at 500 yards did I see anything of any consequence and then it seemed to indicate about 1 MOA less drop per every 100 yards beyond 400 yards (additive, as in 1 MOA less at 500 yards, 2 MOA less at 600 yards, 3 MOA less at 700 yards). Don't forget the lesser effect on wind also but again not until you're out there a bit.
#6
03-04-2005, 11:17 AM
 Gold Member Join Date: Sep 2004 Location: Nevada Posts: 562
Re: Altitude & Temperature Effects on a Bullet?

big game hunter and - 06 [img]/ubbthreads/images/graemlins/smile.gif[/img] [img]/ubbthreads/images/graemlins/confused.gif[/img] Just kidding the ballistic tables will show what's going on.

It's only as acurrate as the info you plug in. Where I've seen mountian hunting affect what I was trying to do was the high wind speeds. wind drift of feet is common, so I use the best BC boat tails for my calibers.
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.270 Ackley improved 29 inch 1.250 dia. target barrel 7mm STW 28 inch 1.250 target barrel. I also love my .458 mag for varmints and the biggest game in the world.
#7
03-04-2005, 11:44 AM
 Silver Member Join Date: Dec 2004 Location: BINGHAMTON, NY Posts: 166
Re: Altitude & Temperature Effects on a Bullet?

well I thought I might run the #s through exbal just to give ya real #'s. I used both a fedral factory load and a winchester super X factory load and both gave the same exact #'s base on 165gr, 20* and 60* and 4500' and 8000'which is all the info you gave.

60* @ 4500' sited at 200yds
1.8" @ 100
0.0" @ 200
7.7" @ 300

20* @ 8000' sited for 200 yrds
1.8" @ 100
0.0" @ 200
7.5" @ 300

only a .2 differance out to 300 yrds.

hope that helps eases you mind.
Ben

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