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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Effects of atmospheric pressure on bullet drop at long range.
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<blockquote data-quote="Gamesniper19" data-source="post: 2344290" data-attributes="member: 95013"><p>First question - did you true your dope at that elevation prior to your shot? Electronics are not full proof and while we all use it, truing your dope at known distance and in known environments matters. Case in point in nearly the exact same environment:</p><p></p><p>My hunting buddy and I were hunting Montana at 7000 ft and in 40 degree temps this year. He is shooting a 30 Nos with a 210 berger. We arrived at the location after his flight and started to shoot. Before we did we checked his torque on all bolts and mounts. We laid prone with a bag and an atlas bipod to ensure a good rest in the field. First, zero at 100 to ensure he is on. Shot a great sub moa 3 shot group. Then we moved to 500 and input all the data - Velocity had a SD of 9 with magnetospeed (yes i travel with it), BC, temps, humidity etc, etc...drop calc on the Kestrel 5700 stated 7 1/4 MOA. First shot at 500 high, second shot high. Corrected 1/2 MOA down, still high burning the edge of the 6 inch plate. Dial 1/2 MOA down to a final 6 1/4 MOA center hit. He is not comfortable shooting more than about 600 so we stopped.</p><p></p><p>Conclusion. True your dope. Know for sure before you hunt. Angles matter and so does everything else. While we could not in the field verify why there was such a diff in dope, the results told us exactly what we needed to do. Could have been something we missed, could have been that the scope tracking isn't perfect (it happens so I verify all my scopes on a tracking board) but the electronics were wrong. DOPE means Data on previous engagements. Know what your rifle will do before you go in the field and it will give you complete confidence in your shots. He harvested a nice mule deer and a nice elk and never had a doubt when he shot. nice feeling</p></blockquote><p></p>
[QUOTE="Gamesniper19, post: 2344290, member: 95013"] First question - did you true your dope at that elevation prior to your shot? Electronics are not full proof and while we all use it, truing your dope at known distance and in known environments matters. Case in point in nearly the exact same environment: My hunting buddy and I were hunting Montana at 7000 ft and in 40 degree temps this year. He is shooting a 30 Nos with a 210 berger. We arrived at the location after his flight and started to shoot. Before we did we checked his torque on all bolts and mounts. We laid prone with a bag and an atlas bipod to ensure a good rest in the field. First, zero at 100 to ensure he is on. Shot a great sub moa 3 shot group. Then we moved to 500 and input all the data - Velocity had a SD of 9 with magnetospeed (yes i travel with it), BC, temps, humidity etc, etc...drop calc on the Kestrel 5700 stated 7 1/4 MOA. First shot at 500 high, second shot high. Corrected 1/2 MOA down, still high burning the edge of the 6 inch plate. Dial 1/2 MOA down to a final 6 1/4 MOA center hit. He is not comfortable shooting more than about 600 so we stopped. Conclusion. True your dope. Know for sure before you hunt. Angles matter and so does everything else. While we could not in the field verify why there was such a diff in dope, the results told us exactly what we needed to do. Could have been something we missed, could have been that the scope tracking isn't perfect (it happens so I verify all my scopes on a tracking board) but the electronics were wrong. DOPE means Data on previous engagements. Know what your rifle will do before you go in the field and it will give you complete confidence in your shots. He harvested a nice mule deer and a nice elk and never had a doubt when he shot. nice feeling [/QUOTE]
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Effects of atmospheric pressure on bullet drop at long range.
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