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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
help with drop field ... exball and field resoults
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<blockquote data-quote="Eaglet" data-source="post: 360018" data-attributes="member: 3756"><p>300rum,</p><p> </p><p>I'm using G7 which I beleive is more accurate than using multiple BC's from G1.</p><p> </p><p>That said, from my figured numbers, if I did it right, you know how that goes, garbage in garbage out; these are my conclusions:</p><p> </p><p>1) From my number to your field results, the bullet impacted 6.9" low.</p><p>2) Again, following the same thinking, the bullet impacted 2.6" low.</p><p>3) Once more, the bullet impacted 6.64" high.</p><p> </p><p>As mentioned above, seems like your ammo was in the sun; you can see how the bullet impact is moving gradually higher; or, you were shooting your groups without letting the barrel cool down enough... Once the barrel starts getting hot, if we leave the ammo in the chamber for little longer than a short time, it'll be enough to get higher muzzle velocities and impact higher as it gets warmer. </p><p> </p><p>Then again, the differences are not that huge and shoulder pressure from group to group could do that.</p><p> </p><p>If you chronographed the load, what kind of spread are you getting?</p><p> </p><p>The numbers for vertical adjustment I got were: 5.4 moa; 10.9 moa; and 22.1 moa. </p><p> </p><p>I hope it helps...</p></blockquote><p></p>
[QUOTE="Eaglet, post: 360018, member: 3756"] 300rum, I'm using G7 which I beleive is more accurate than using multiple BC's from G1. That said, from my figured numbers, if I did it right, you know how that goes, garbage in garbage out; these are my conclusions: 1) From my number to your field results, the bullet impacted 6.9" low. 2) Again, following the same thinking, the bullet impacted 2.6" low. 3) Once more, the bullet impacted 6.64" high. As mentioned above, seems like your ammo was in the sun; you can see how the bullet impact is moving gradually higher; or, you were shooting your groups without letting the barrel cool down enough... Once the barrel starts getting hot, if we leave the ammo in the chamber for little longer than a short time, it'll be enough to get higher muzzle velocities and impact higher as it gets warmer. Then again, the differences are not that huge and shoulder pressure from group to group could do that. If you chronographed the load, what kind of spread are you getting? The numbers for vertical adjustment I got were: 5.4 moa; 10.9 moa; and 22.1 moa. I hope it helps... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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help with drop field ... exball and field resoults
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