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Long Range Hunting & Shooting
Accuracy change with Altitude change.
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<blockquote data-quote="4xforfun" data-source="post: 719438" data-attributes="member: 9172"><p>You are injecting a third parameter. Keeping the gun warm was not the issue...accuracy was. " WILL ACCURACY CHANGE WITH ELEVATION CHANGE" is the question. I do a bunch of my 1000 yard BR load work in the dead of winter. I keep the gun warm by shooting it...never let it get cold. In fact I get them HOT, just like at a match. After the first few shots I am ready to start shooting groups. Keeping the ammo warm is the most important factor. Mine sits in my warm truck untill it is time to shoot. Group size is no different at zero F than it is at 80F...as long as you keep things constant. I am just saying that all things (gun and ammo related) being equal.....temp, humidity, alt, baro(which takes the place of alt) ....EXTERIOR BALISTICS...will not change the group size. Only POI will change.</p><p> </p><p>Yes, you are all right ..to a degree....gun temps, ammo temps,...and on and on...all will change group size. You can't possably keep things warm in the field. That is a change in INTERIOR balistics. BUT..you are all thinking that the groups will get bigger. Why can't they get smaller? This is LRH...most everyone here shoots larger caliber magnums. I am pretty sure that everyone didn't do thier load development in1/10 of a gr increments and found that absolute PERFECT tune. Your ammo gets cold...you loose 10, 20, maybe 30 fps...who is to say that that decrease in velocity won't bring your gun MORE into tune? I had the oppisate happen to me at the 2011 IBS 1000 yard nationals in WV.....It was 92 -95 degrees. I have never shot in that warm of temp. the only way for me to shoot those conditions at home is to get things HOT and let the case cook in the chamber for xx seconds to get the ammo hot...or leave them in the sun..or the oven. Or load hotter ammo. Anyway..long story short, my gun shot better than it ever has in the hot weather. things got hot, velocity's went up ( a factor of interior balistics), the gun came MORE into tune, and I took home most of the wood.</p><p> </p><p>And as far as the shooter..you are absolutly right....higher elevation...less O2, breathing harder....mabe not as comforatable shooting on the range as he is at home....ect....can and will make groups get bigger.</p></blockquote><p></p>
[QUOTE="4xforfun, post: 719438, member: 9172"] You are injecting a third parameter. Keeping the gun warm was not the issue...accuracy was. " WILL ACCURACY CHANGE WITH ELEVATION CHANGE" is the question. I do a bunch of my 1000 yard BR load work in the dead of winter. I keep the gun warm by shooting it...never let it get cold. In fact I get them HOT, just like at a match. After the first few shots I am ready to start shooting groups. Keeping the ammo warm is the most important factor. Mine sits in my warm truck untill it is time to shoot. Group size is no different at zero F than it is at 80F...as long as you keep things constant. I am just saying that all things (gun and ammo related) being equal.....temp, humidity, alt, baro(which takes the place of alt) ....EXTERIOR BALISTICS...will not change the group size. Only POI will change. Yes, you are all right ..to a degree....gun temps, ammo temps,...and on and on...all will change group size. You can't possably keep things warm in the field. That is a change in INTERIOR balistics. BUT..you are all thinking that the groups will get bigger. Why can't they get smaller? This is LRH...most everyone here shoots larger caliber magnums. I am pretty sure that everyone didn't do thier load development in1/10 of a gr increments and found that absolute PERFECT tune. Your ammo gets cold...you loose 10, 20, maybe 30 fps...who is to say that that decrease in velocity won't bring your gun MORE into tune? I had the oppisate happen to me at the 2011 IBS 1000 yard nationals in WV.....It was 92 -95 degrees. I have never shot in that warm of temp. the only way for me to shoot those conditions at home is to get things HOT and let the case cook in the chamber for xx seconds to get the ammo hot...or leave them in the sun..or the oven. Or load hotter ammo. Anyway..long story short, my gun shot better than it ever has in the hot weather. things got hot, velocity's went up ( a factor of interior balistics), the gun came MORE into tune, and I took home most of the wood. And as far as the shooter..you are absolutly right....higher elevation...less O2, breathing harder....mabe not as comforatable shooting on the range as he is at home....ect....can and will make groups get bigger. [/QUOTE]
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