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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Help with trajectory please "thing"
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<blockquote data-quote="britz" data-source="post: 268540" data-attributes="member: 7865"><p>Hi, The first thing I would do is get your load chronographed over at least 5 shots and the more the better. I did a little checking and Hodgdon's data shows that you would be getting about 2850 FPS or maybe a little more. THe thing is you can't just go by what the book says. You can mess around with a calculator and the two known distances, drops and play with the numbers to find out what your velocity is... but it's a pain. Go to <a href="http://www.eskimo.com/~jbm/cgi-bin/jbmtraj-5.0.cgi" target="_blank">JBM - Calculations - Trajectory</a> Enter in your velocity for 2850 and the 0.648 BC and you will be very close to what your field varifications were 2950 really sounds a little high for that bullet. I'm shooting a wsm and Pushing the thing pretty hard from a 24" barrel getting 2950 from the muzzle w/ 180 grain bullets. The win mag has a little more torque but not that much.</p><p></p><p>Good luck. </p><p></p><p>Also, I would start off by shooting at 200, 600, and 900 without moving the scope and shoot 5 rd groups at each. Measure in inches what the actual drop was. This will give you a very good measurement of the true BC of your bullet, or tell you if your measured velocity is accurate.</p></blockquote><p></p>
[QUOTE="britz, post: 268540, member: 7865"] Hi, The first thing I would do is get your load chronographed over at least 5 shots and the more the better. I did a little checking and Hodgdon's data shows that you would be getting about 2850 FPS or maybe a little more. THe thing is you can't just go by what the book says. You can mess around with a calculator and the two known distances, drops and play with the numbers to find out what your velocity is... but it's a pain. Go to [url=http://www.eskimo.com/~jbm/cgi-bin/jbmtraj-5.0.cgi]JBM - Calculations - Trajectory[/url] Enter in your velocity for 2850 and the 0.648 BC and you will be very close to what your field varifications were 2950 really sounds a little high for that bullet. I'm shooting a wsm and Pushing the thing pretty hard from a 24" barrel getting 2950 from the muzzle w/ 180 grain bullets. The win mag has a little more torque but not that much. Good luck. Also, I would start off by shooting at 200, 600, and 900 without moving the scope and shoot 5 rd groups at each. Measure in inches what the actual drop was. This will give you a very good measurement of the true BC of your bullet, or tell you if your measured velocity is accurate. [/QUOTE]
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Help with trajectory please "thing"
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