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Long Range Hunting & Shooting
spin drift & Coriolis effect
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<blockquote data-quote="tresmon" data-source="post: 488067" data-attributes="member: 12397"><p>Rem, </p><p></p><p>2.5" does matter @ 1000 yards. You make the same mistake/assumption everyone else does.</p><p></p><p></p><p>Let's say I'm making a 1000 yard shot at a white tail deer. I'm shooting at a 10, maybe 12 inch vital zone.</p><p></p><p>I guess the wind and break the shot.</p><p></p><p>Well, I pulled the shot to the right 1". That's a teeny pull if it only effects the 1000 yard shot an inch. But now my bullet is going to land tin the right quadrant of the 10 inch kills zone, matter of fact 1 inch right of center, but still 4 " from the right edge of the kill zone. So we're good.</p><p></p><p>I thought the crosswind was value x and would drift my bullet 8" and I compensated for 8". However the wind is actually y which is a bit more and will actually push my bullet an additional 4" that I had not anticipated. </p><p></p><p>So my 1" right pulled shot, plus my extra, unaccounted 4" of drift have now added together for 5" right error and my bullet is going to land in the very extreme right edge of the kill zone. So I got lucky, I'm still barely on the VERY edge of the kills zone.</p><p></p><p>OPPS! I forgot to add "those three little inches" of coriolis effect. Crap </p><p></p><p>1" pull error + 4" wind error, plus 3" coriolis =8" and now I've hit the animal well outside the vital zone.</p><p></p><p>I arrest my case. As I said, every "little" thing counts in long range shooting and the long range shooter needs all the help he can get as well as he needs to split every hair on the figuring & prepping end of the long range shot.</p><p></p><p>The same is said for long range competition shooting. A teeny little disregarded inch can make the difference of a 10 ring hit or a 9 ring hit and cost you the match.</p><p></p><p>Same for a tactical match shooting at steel targets. That little "insignificant 2.5 inches" can mean the difference between hitting the edge of the steel plate and winning or missing the edge by an inch and blowing the match.</p><p></p><p>The further the shot, the more heavily little things need to be scrutinized and factored in.</p></blockquote><p></p>
[QUOTE="tresmon, post: 488067, member: 12397"] Rem, 2.5" does matter @ 1000 yards. You make the same mistake/assumption everyone else does. Let's say I'm making a 1000 yard shot at a white tail deer. I'm shooting at a 10, maybe 12 inch vital zone. I guess the wind and break the shot. Well, I pulled the shot to the right 1". That's a teeny pull if it only effects the 1000 yard shot an inch. But now my bullet is going to land tin the right quadrant of the 10 inch kills zone, matter of fact 1 inch right of center, but still 4 " from the right edge of the kill zone. So we're good. I thought the crosswind was value x and would drift my bullet 8" and I compensated for 8". However the wind is actually y which is a bit more and will actually push my bullet an additional 4" that I had not anticipated. So my 1" right pulled shot, plus my extra, unaccounted 4" of drift have now added together for 5" right error and my bullet is going to land in the very extreme right edge of the kill zone. So I got lucky, I'm still barely on the VERY edge of the kills zone. OPPS! I forgot to add "those three little inches" of coriolis effect. Crap 1" pull error + 4" wind error, plus 3" coriolis =8" and now I've hit the animal well outside the vital zone. I arrest my case. As I said, every "little" thing counts in long range shooting and the long range shooter needs all the help he can get as well as he needs to split every hair on the figuring & prepping end of the long range shot. The same is said for long range competition shooting. A teeny little disregarded inch can make the difference of a 10 ring hit or a 9 ring hit and cost you the match. Same for a tactical match shooting at steel targets. That little "insignificant 2.5 inches" can mean the difference between hitting the edge of the steel plate and winning or missing the edge by an inch and blowing the match. The further the shot, the more heavily little things need to be scrutinized and factored in. [/QUOTE]
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