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The Range
Rifle & Shotgun Discussion
I got my Dope
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<blockquote data-quote="swampratt" data-source="post: 2794790" data-attributes="member: 15054"><p>The math does not always compute so I set out yesterday to get the drop on my 30-06 and my .308.</p><p></p><p>I set zero at 100 yards and shot at 100-200-300-400 yards aiming at the same spot on the tall cardboard I set up to shoot at.</p><p></p><p>My chrony must be reading slow by over 100 fps for the math to work out when I compare it to a ballistic calculator.</p><p>This is why we need to actually shoot and see what happens.</p><p></p><p>.308 is a 168 gr. with a BC of .535 </p><p>3" low @200 yards.</p><p>13.5" low @ 300 yards .</p><p>30" low @ 400 yards.</p><p></p><p>For 300 I set my scope turrets ar 4.5 clicks. At 400 I set it at 7.5 clicks.</p><p>The .308 is under 1.75" group at 300 yards.</p><p>At 400 yards it is under 3" group.</p><p></p><p></p><p>The 30-06 grouped well to 300 but barrel heat or maybe the load killed it for the 400 yard testing.</p><p>The online ballistic calculator to make the drop come out puts this 155gr at 3200fps or so..NO way i believe that.</p><p></p><p>30-06 load 155 gr Amax .475 BC</p><p> 100 yard zero.</p><p> 8.5" low @ 300 yards.</p><p>20-21" low@ 400 yards.</p><p>100 yard zero.</p><p></p><p>Going to clean the 30-06 barrel as i feel some copper fouling is creating some issues.</p><p></p><p>I found the scope clicks do not exactly match the inches of drop.. 1 click for 1"</p><p>Another reason to get out and shoot those guns.. get your own Dope <img src="/images/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="swampratt, post: 2794790, member: 15054"] The math does not always compute so I set out yesterday to get the drop on my 30-06 and my .308. I set zero at 100 yards and shot at 100-200-300-400 yards aiming at the same spot on the tall cardboard I set up to shoot at. My chrony must be reading slow by over 100 fps for the math to work out when I compare it to a ballistic calculator. This is why we need to actually shoot and see what happens. .308 is a 168 gr. with a BC of .535 3" low @200 yards. 13.5" low @ 300 yards . 30" low @ 400 yards. For 300 I set my scope turrets ar 4.5 clicks. At 400 I set it at 7.5 clicks. The .308 is under 1.75" group at 300 yards. At 400 yards it is under 3" group. The 30-06 grouped well to 300 but barrel heat or maybe the load killed it for the 400 yard testing. The online ballistic calculator to make the drop come out puts this 155gr at 3200fps or so..NO way i believe that. 30-06 load 155 gr Amax .475 BC 100 yard zero. 8.5" low @ 300 yards. 20-21" low@ 400 yards. 100 yard zero. Going to clean the 30-06 barrel as i feel some copper fouling is creating some issues. I found the scope clicks do not exactly match the inches of drop.. 1 click for 1" Another reason to get out and shoot those guns.. get your own Dope :) [/QUOTE]
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