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Hunting
Long Range Hunting & Shooting
**HELP** Need to understand trajectory(heavy VS light) in bullets.
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<blockquote data-quote="aroshtr" data-source="post: 448488" data-attributes="member: 9176"><p>Trajectory (original question):</p><p>It has been my experiance that up to about 500-600 yards, with typical hunting calibers, it is more benificial to use the light fast bullet. This is for both trajectory and wind (time of flight). Beyond 600 the numbers always seem to favor the heavier bullets. I feel this is mostly for wind, but trajectory benifits start to come into play beyond 800 yards.</p><p> </p><p>Spin Drift:</p><p>I agree that bullets will climb (actually fall less) and fall faster than expected depending on which way the wind is blowing. But in a no wind situation, keep in mind that you will always have spin drift to the right with a right twist barrel. This is directly tied the RPM (twist rate of your barrel and velocity), the length/BC of the bullet, and air density. The reason you will always have spin drift to the right in a right twist barrel is that your bullet is falling at about 22mph (newtons 9.8mps2 is roughly 22mph for the first second). Thus it would take a severe wind for the elevation change due to crosswind to even equal the drift from the falling bullet. Condisering the spin drift up to 1000yrds is usually .5-.75moa, I don't think a hunter should even consider the vertical component of spin drift due to wind. I know I won't be taking a 1000yrd shot at an animal in a 20mph wind.....</p><p> </p><p>aroshtr</p></blockquote><p></p>
[QUOTE="aroshtr, post: 448488, member: 9176"] Trajectory (original question): It has been my experiance that up to about 500-600 yards, with typical hunting calibers, it is more benificial to use the light fast bullet. This is for both trajectory and wind (time of flight). Beyond 600 the numbers always seem to favor the heavier bullets. I feel this is mostly for wind, but trajectory benifits start to come into play beyond 800 yards. Spin Drift: I agree that bullets will climb (actually fall less) and fall faster than expected depending on which way the wind is blowing. But in a no wind situation, keep in mind that you will always have spin drift to the right with a right twist barrel. This is directly tied the RPM (twist rate of your barrel and velocity), the length/BC of the bullet, and air density. The reason you will always have spin drift to the right in a right twist barrel is that your bullet is falling at about 22mph (newtons 9.8mps2 is roughly 22mph for the first second). Thus it would take a severe wind for the elevation change due to crosswind to even equal the drift from the falling bullet. Condisering the spin drift up to 1000yrds is usually .5-.75moa, I don't think a hunter should even consider the vertical component of spin drift due to wind. I know I won't be taking a 1000yrd shot at an animal in a 20mph wind..... aroshtr [/QUOTE]
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**HELP** Need to understand trajectory(heavy VS light) in bullets.
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