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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
bullet drop and scope leveling
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<blockquote data-quote="Chawlston" data-source="post: 103220"><p>I agree with the above statement. I routinely shoot up to 978 yards down a 30 foot wide opening through 60 foot tall pine trees that act as a very good wind brake. </p><p></p><p>I always zero my gun dead nuts right on at 400 yards and then check it on successive days to verify zero. We have even shot 5-shot groups over several days (ie two shots today, two tomorrow and one on the third day that were .5" or better. Afer the 400 yard zero is obtained and confirmed on three different days, we progressively move the drop board out in 100 yard increments to derive drop tables for the particular cartrige. Additionally, I have placed 3/4" maskng tape level across the top of the board and another 90 degress vertical to use as an aiming point.</p><p></p><p>We have found that the higher BC bullets tend to track closer to the vertical aiming line (ie lesser drift) while the lesser BC bullets travel further away (ie more drift) from the line. In fact during some of our testing last year, we were actually hitting the masking tape at the 900 yard mark when holding dead on. Finally, the bullet drift in minimal wind conditions was so slight with higher BC bullets, anything over a 2" drift was considered a bad shot.</p><p></p><p>We only shoot to derive the drop tables when it is cloudy or before the sun rays hit the ground causing mirage.</p><p></p><p>In short, using wind flags with the pine trees blocking the wind and shooting at times when mirage has not started has yeilded some very consistent shooting results. Our most accurate bullets were the Lost River bullets seated with the ogives .020" to .050" away from the rifling. Many times the two shots at each range, the holes were touching all the way out to the 800 yard line. We never got the 900 yard shots to touch. Too bad the Lost River bullets (both poly and metal tipped) do not expand. We found this out the hard way when deer were hit and knocked down only to get up and run off and later killed with healed-over Lost River bullet wounds.</p><p></p><p>Anyway, we did not see much drift due to spin and we were shooting 8 twist barrels.</p><p></p><p>James</p></blockquote><p></p>
[QUOTE="Chawlston, post: 103220"] I agree with the above statement. I routinely shoot up to 978 yards down a 30 foot wide opening through 60 foot tall pine trees that act as a very good wind brake. I always zero my gun dead nuts right on at 400 yards and then check it on successive days to verify zero. We have even shot 5-shot groups over several days (ie two shots today, two tomorrow and one on the third day that were .5" or better. Afer the 400 yard zero is obtained and confirmed on three different days, we progressively move the drop board out in 100 yard increments to derive drop tables for the particular cartrige. Additionally, I have placed 3/4" maskng tape level across the top of the board and another 90 degress vertical to use as an aiming point. We have found that the higher BC bullets tend to track closer to the vertical aiming line (ie lesser drift) while the lesser BC bullets travel further away (ie more drift) from the line. In fact during some of our testing last year, we were actually hitting the masking tape at the 900 yard mark when holding dead on. Finally, the bullet drift in minimal wind conditions was so slight with higher BC bullets, anything over a 2" drift was considered a bad shot. We only shoot to derive the drop tables when it is cloudy or before the sun rays hit the ground causing mirage. In short, using wind flags with the pine trees blocking the wind and shooting at times when mirage has not started has yeilded some very consistent shooting results. Our most accurate bullets were the Lost River bullets seated with the ogives .020" to .050" away from the rifling. Many times the two shots at each range, the holes were touching all the way out to the 800 yard line. We never got the 900 yard shots to touch. Too bad the Lost River bullets (both poly and metal tipped) do not expand. We found this out the hard way when deer were hit and knocked down only to get up and run off and later killed with healed-over Lost River bullet wounds. Anyway, we did not see much drift due to spin and we were shooting 8 twist barrels. James [/QUOTE]
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