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Long Range Hunting & Shooting
Ballistic calculators off real life drop. why?
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<blockquote data-quote="RandySch" data-source="post: 1579438" data-attributes="member: 66730"><p>I have had the same issue with a couple of different rifles. Both .270 Winchester. The first one, I sighted in at 200 yards at a lower elevation. When I returned to a range closer to home, which is at a higher elevation, the first few shots confirmed dead on at 200. I thought that was odd, thought my shots should be higher. When I returned to the range the next time I started shooting at 500 & 600 yards and my shots were all high. The next time I returned with newly loaded ammo, reloaded to the same specs as previously, my zero was at 225 yards. Using this as my zero I recalculated my drop chart. My shots were spot on at 500 & 600 yards.</p><p> My other rifle was also shooting high however my zero confirmed dead on at 200 yards. I did the Tall Target Test and confirmed my elevation tracking was working fine. Next I did velocity verification by shooting at 600 yards. My chrono was giving me a velocity of about 3125 for a 140gr TSX which I thought was probably close. However after I adjusted my drop chart calculations using the adjustment for the 600 yard shots I discovered my muzzle velocity to be about 3200 FPS. Revisiting the range with new drop data based on this velocity I shot at 300, 400, 500, & 600 yards and my shots were all spot on.</p></blockquote><p></p>
[QUOTE="RandySch, post: 1579438, member: 66730"] I have had the same issue with a couple of different rifles. Both .270 Winchester. The first one, I sighted in at 200 yards at a lower elevation. When I returned to a range closer to home, which is at a higher elevation, the first few shots confirmed dead on at 200. I thought that was odd, thought my shots should be higher. When I returned to the range the next time I started shooting at 500 & 600 yards and my shots were all high. The next time I returned with newly loaded ammo, reloaded to the same specs as previously, my zero was at 225 yards. Using this as my zero I recalculated my drop chart. My shots were spot on at 500 & 600 yards. My other rifle was also shooting high however my zero confirmed dead on at 200 yards. I did the Tall Target Test and confirmed my elevation tracking was working fine. Next I did velocity verification by shooting at 600 yards. My chrono was giving me a velocity of about 3125 for a 140gr TSX which I thought was probably close. However after I adjusted my drop chart calculations using the adjustment for the 600 yard shots I discovered my muzzle velocity to be about 3200 FPS. Revisiting the range with new drop data based on this velocity I shot at 300, 400, 500, & 600 yards and my shots were all spot on. [/QUOTE]
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Ballistic calculators off real life drop. why?
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