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Hunting
Extreme Long Range Hunting & Shooting (ELR)
SCOPE ZERO FOR OVER 1000 YRDS
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<blockquote data-quote="LRNut" data-source="post: 1944903" data-attributes="member: 3230"><p>Several issues with this logic. Most of us still need to use a rangefinder to discern if that animal is 275 or 325 yards away; since you have measure it, you might as well hold for it. Animals less than 200 yards are much easier to discern that they are indeed close enough not to range, and the 200 yard zero works perfectly.</p><p></p><p>But just as important: if your trajectory is 4" high, half your bullets will be higher. If trying to hit a 10" target you are going to miss high at times due to this.</p><p></p><p>Bullets don't travel in a straight line; half are above, half are below. Half are to the right, and half to the left. Too many shooters think bullets have no dispersion, but they do. Same logic applies to your allowable wind estimation error. Suppose you can shoot a six inch group at 1200 yards. If you are trying to hit a ten inch circle, you only have two inches of "freeboard" on either side before you risk missing. What does it take to blow a 195 Berger at 2950 2" at 1200 yards? 3/10 of one mile per hour. In other words, to keep them all on the 10" plate you need to call the wind absolutely perfectly. Of course, you could blow the wind call by 1 mph, which would result in theoretically missing, since the drift would be .5 MOA or 6 inches. However, since half the bullets hit to one side, you would have nearly a 50% chance of hitting with an errant wind call, perhaps even hitting dead center. You would conclude it was a perfect wind call. Make it 2 mph however, and you miss every time.</p></blockquote><p></p>
[QUOTE="LRNut, post: 1944903, member: 3230"] Several issues with this logic. Most of us still need to use a rangefinder to discern if that animal is 275 or 325 yards away; since you have measure it, you might as well hold for it. Animals less than 200 yards are much easier to discern that they are indeed close enough not to range, and the 200 yard zero works perfectly. But just as important: if your trajectory is 4" high, half your bullets will be higher. If trying to hit a 10" target you are going to miss high at times due to this. Bullets don't travel in a straight line; half are above, half are below. Half are to the right, and half to the left. Too many shooters think bullets have no dispersion, but they do. Same logic applies to your allowable wind estimation error. Suppose you can shoot a six inch group at 1200 yards. If you are trying to hit a ten inch circle, you only have two inches of "freeboard" on either side before you risk missing. What does it take to blow a 195 Berger at 2950 2" at 1200 yards? 3/10 of one mile per hour. In other words, to keep them all on the 10" plate you need to call the wind absolutely perfectly. Of course, you could blow the wind call by 1 mph, which would result in theoretically missing, since the drift would be .5 MOA or 6 inches. However, since half the bullets hit to one side, you would have nearly a 50% chance of hitting with an errant wind call, perhaps even hitting dead center. You would conclude it was a perfect wind call. Make it 2 mph however, and you miss every time. [/QUOTE]
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SCOPE ZERO FOR OVER 1000 YRDS
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