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Posted: 4/25/2011 4:44:11 PM EDT
| I currently live in WI (about 8-900 feet above sea level). I want to load up a bunch of .223 ammo to take to Colorado where I will be working this summer (6-12,000 feet above sea level). I was wondering if anyone had any insight on loads that are tested at one elevation and the shot at a much different elevation. Any in-site is appreciated. |
| I don't have experience with this, but I don't think that the ammo itself would be affected (unless the temperature was different to a degree), but the accuracy would be. I would think at least the POI would be different, and they may be generally more or less accurate than they were at the original altitude. Just my thoughts though. |
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I live at 6,100 ft asl and regularly shoot up to 10,000 ft asl on 75º - 85º days and both my ARs like 25.1 grns of H335 under a 55grn FMJBT bullet and Win primer with an OAL 2.225". My records show that produces 2,816 fps average in my 20" A4. How would that compare with where you live? Load some and see and then report back. |
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The propellants in a self contained cartridge generate their own oxygen, so changing altitude will make absolutely no difference while the bullet is still in the barrel. You could even fire a cartridge in a perfect vacuum, no oxygen at all, it wouldn't make any difference. Altitude can effect aerodynamics and the trajectory of the bullet, and the thinner air will offer less resistance to the bullet, I haven't shot anywhere that was at a significantly different altitude than my home area, so I don't really know what the effects might amount to. |
| Well, I live in Colorado and shoot a the higher elevations. I have shot in Ohio at the National matches, so I guess I can say from experience that the velocity etc will be the same but at longer distances (like at 600 yds) the zero won't. I have to put more elevation on due to the denser air. With out getting my log book out, it was about a minute or so. That was like wise true shooting at Camp Pendleton, CA. So you will find your self shooting "higher" since you are going to the less dense air.......... |
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Quoted:
Well, I live in Colorado and shoot a the higher elevations. I have shot in Ohio at the National matches, so I guess I can say from experience that the velocity etc will be the same but at longer distances (like at 600 yds) the zero won't. I have to put more elevation on due to the denser air. With out getting my log book out, it was about a minute or so. That was like wise true shooting at Camp Pendleton, CA. So you will find your self shooting "higher" since you are going to the less dense air.......... Had to re-zero all my rifles when I moved fro Kiowa CO to SC. |
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