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Long Range Hunting & Shooting
How Much Does Barometric Pressure Change?
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<blockquote data-quote="Ridge Runner" data-source="post: 219412" data-attributes="member: 951"><p>Len, thats just an example I use, I ran the numbers once I think it was my 270 wea. firing a 140 gr GKHP @3200 fps, and a 4" swing in BP changed the POI like 50" at 1K, think the BC is .354.</p><p>from 29" to 31.5" of BP swing the BC runs from .357 to .329 drops will change POI at 1K from -318.5" to -349.5. 700 yard drops BP of 29.4 -99.06, 31.5"- -105.81 so that 6" of drop at 700 computes to 41" at 1K</p><p> like stated before an example I use for the shepaerd scope and other BDC guys who make those outlandish claims about 1K shooting with a BDC. </p><p></p><p>Just reran the numbers again using load from a disc for windows</p><p>RR</p></blockquote><p></p>
[QUOTE="Ridge Runner, post: 219412, member: 951"] Len, thats just an example I use, I ran the numbers once I think it was my 270 wea. firing a 140 gr GKHP @3200 fps, and a 4" swing in BP changed the POI like 50" at 1K, think the BC is .354. from 29" to 31.5" of BP swing the BC runs from .357 to .329 drops will change POI at 1K from -318.5" to -349.5. 700 yard drops BP of 29.4 -99.06, 31.5"- -105.81 so that 6" of drop at 700 computes to 41" at 1K like stated before an example I use for the shepaerd scope and other BDC guys who make those outlandish claims about 1K shooting with a BDC. Just reran the numbers again using load from a disc for windows RR [/QUOTE]
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How Much Does Barometric Pressure Change?
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