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Long Range Hunting & Shooting
Barnes Ammo - Extreme temperature sensitivity with VOR-TX?
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<blockquote data-quote="Bravo 4" data-source="post: 1142128" data-attributes="member: 8873"><p>If going from hot to cold I would think the opposite would occur, hitting lower not higher. That would be for both ambient and ammo temps. Run the numbers in your ballistic calculator again and change the temps. Also during those weather changes there will probably be changes in station pressure that would need to be noted and input as well to get a real solution to your problem. Other info would help as well; zero range and distance shooting, have you previously shot and confirmed DOPE, do you know your true muzzle velocity or just going off what the box said, how well does your rifle group that load, have you checked the adjustments in the scope, parallax adjusted for, did you change rests (zero off bipod- shooting off the side of a deer stand)...just off the top of my head, I can go on but you get the point. There are several variables not mentioned.</p><p></p><p>Having said that and not knowing any particulars, I just punched some numbers into my app. 150 TTSX @2950 assuming a 200 yard zero and with a .5 mil adjustment you are shooting 300 yards or less.</p><p>Went from:28.5 hg/65 degrees at 300 yards= .6 mil drop</p><p>To: 31.5 hg/30 degrees at 300 yards= .65 mil drop</p><p>Those are some big changes in temp and pressure, from good to bad for bullet flight and only a .05 mil change. </p><p>Even if you punch in those numbers and put 2900fps (for shooting in the lower temp and higher pressure) to account for a big change in lower powder (ammo) temp change it still only makes it .68 mils.</p><p></p><p>If you are anywhere near these conditions and hitting .2 mils high then I would suspect it to be something else. Like I said, it should go the other way around anyways...you should be hitting lower. I suspect it's something else. Also remember with the apps its "crap in= crap out"!</p></blockquote><p></p>
[QUOTE="Bravo 4, post: 1142128, member: 8873"] If going from hot to cold I would think the opposite would occur, hitting lower not higher. That would be for both ambient and ammo temps. Run the numbers in your ballistic calculator again and change the temps. Also during those weather changes there will probably be changes in station pressure that would need to be noted and input as well to get a real solution to your problem. Other info would help as well; zero range and distance shooting, have you previously shot and confirmed DOPE, do you know your true muzzle velocity or just going off what the box said, how well does your rifle group that load, have you checked the adjustments in the scope, parallax adjusted for, did you change rests (zero off bipod- shooting off the side of a deer stand)...just off the top of my head, I can go on but you get the point. There are several variables not mentioned. Having said that and not knowing any particulars, I just punched some numbers into my app. 150 TTSX @2950 assuming a 200 yard zero and with a .5 mil adjustment you are shooting 300 yards or less. Went from:28.5 hg/65 degrees at 300 yards= .6 mil drop To: 31.5 hg/30 degrees at 300 yards= .65 mil drop Those are some big changes in temp and pressure, from good to bad for bullet flight and only a .05 mil change. Even if you punch in those numbers and put 2900fps (for shooting in the lower temp and higher pressure) to account for a big change in lower powder (ammo) temp change it still only makes it .68 mils. If you are anywhere near these conditions and hitting .2 mils high then I would suspect it to be something else. Like I said, it should go the other way around anyways...you should be hitting lower. I suspect it's something else. Also remember with the apps its "crap in= crap out"! [/QUOTE]
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Barnes Ammo - Extreme temperature sensitivity with VOR-TX?
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