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Long Range Hunting & Shooting
Anybody calculated AccuBond B.C?
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<blockquote data-quote="kiwhite" data-source="post: 170593" data-attributes="member: 5243"><p><strong>Published ballistic coefecient</strong></p><p></p><p>My experience with the 160 Accubond in the 7mm rem mag. I am shooting at about 5600' elevation, 65 degrees 30% humidity. i have to adjust published #'s on all bullets up by 80 to100 points. When I plug in published #'s for bullets with my chrono velocity's and all other factors they shoot high. The .338 225 Acubnd will shoot 2 high @ 1000 yards. When I plug in .612 for BC instead of Noslers published .550 then the calculations are correct for it at any range from 100 to 1000. I see the same thing with the .300 sierra HPBTMK out of the .338 Edge. I use .871 for it in the Edge Load. Sierra says it is .750.</p><p> The higher the altitude the less dense the air. Cold air is less dense than hot air. that's a big reason most flatlanders are shooting over everything at high altitude.</p><p> I WAS TOLD BY A KNOWING GENTLEMAN AT BARNES BULLETS THAT AT THIS ALTITUDE TO ADJUST ALL CALCULATIONS WITH .080/.120 UP OVER PUBLISHED BC'S AND IT WOULD GET ME CLOSER TO CENTER ON LONGER RANGE SHOOTING. I HAVE FOUND IT TO BE A VERY TRUE STATEMENT. WHAT IS PUBLISHED IS BASICILY FOR SEA LEVEL WITH HIGH HUMIDY AND DIFFERENT BAROMETRIC PRESSURE THAN YOU WILL SEE AS YOU GO UPHILL.</p><p> Build your LOAD, set some Targets and SHOOT. WRITE DOWN EVERYTHING.</p><p></p><p> HOPE THIS HELPS</p></blockquote><p></p>
[QUOTE="kiwhite, post: 170593, member: 5243"] [b]Published ballistic coefecient[/b] My experience with the 160 Accubond in the 7mm rem mag. I am shooting at about 5600' elevation, 65 degrees 30% humidity. i have to adjust published #'s on all bullets up by 80 to100 points. When I plug in published #'s for bullets with my chrono velocity's and all other factors they shoot high. The .338 225 Acubnd will shoot 2 high @ 1000 yards. When I plug in .612 for BC instead of Noslers published .550 then the calculations are correct for it at any range from 100 to 1000. I see the same thing with the .300 sierra HPBTMK out of the .338 Edge. I use .871 for it in the Edge Load. Sierra says it is .750. The higher the altitude the less dense the air. Cold air is less dense than hot air. that's a big reason most flatlanders are shooting over everything at high altitude. I WAS TOLD BY A KNOWING GENTLEMAN AT BARNES BULLETS THAT AT THIS ALTITUDE TO ADJUST ALL CALCULATIONS WITH .080/.120 UP OVER PUBLISHED BC'S AND IT WOULD GET ME CLOSER TO CENTER ON LONGER RANGE SHOOTING. I HAVE FOUND IT TO BE A VERY TRUE STATEMENT. WHAT IS PUBLISHED IS BASICILY FOR SEA LEVEL WITH HIGH HUMIDY AND DIFFERENT BAROMETRIC PRESSURE THAN YOU WILL SEE AS YOU GO UPHILL. Build your LOAD, set some Targets and SHOOT. WRITE DOWN EVERYTHING. HOPE THIS HELPS [/QUOTE]
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Anybody calculated AccuBond B.C?
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