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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistics Question
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<blockquote data-quote="Bart B" data-source="post: 653325" data-attributes="member: 5302"><p>I have no idea whatsoever. Read the software's instructions. If it doesn't explain how, here's what you can do.</p><p></p><p>Let's say your software says a given bullet drops 300 inches at 800 yards for a given muzzle velocity and atmospheric conditions. After getting a good zero at 100 yards, add the bullet's drop at 100 yards (from the software) to the scope height above the bore; let's say it's 3 inches. Adjust the scope's elevation down whatever it takes to move the reticule exactly 3 inches down. Now your scope's "ballistically" bore sighted to the rifle.</p><p></p><p>Next, move the elevation adjustment the number of clicks to move impact up 303 inches at 800 yards. If one click's worth .2353 MOA, you'll need to come up 37.875 MOA or 161 clicks. Each click moves impact 1.8825 inch, 303 divided by 1.8825 is 161. </p><p></p><p>Go shoot at 800 yards. If your not right on in elevation for the atmospheric conditions at the range, one or more of the following's not good:</p><p></p><p>* The actual range to the target</p><p></p><p>* Ballistic software</p><p></p><p>* BC for the bullet</p><p></p><p>* Muzzle velocity</p><p></p><p>* Atmospheric conditions entered</p><p></p><p>I've used Sierra Bullets' software for .308 Win. .30-06, and two 30 caliber magnums with different bullet weights and velocities on rifles with sights having ajustments per click of .2 MOA to .6 MOA testing at 600 and 1000 yards. Calculating sight settings using the above method's put first shot within 1/2 MOA of perfect elevation for each. I think the reason is Sierra's software uses 3 to 5 BC's for their bullets that's been determined by actual firing tests measuring time of flight between two points. Shooter software uses only 1 BC for each bullet and I don't think that's going to produce data as reliable as software using BC's the bullet actually has at different speeds through the air.</p></blockquote><p></p>
[QUOTE="Bart B, post: 653325, member: 5302"] I have no idea whatsoever. Read the software's instructions. If it doesn't explain how, here's what you can do. Let's say your software says a given bullet drops 300 inches at 800 yards for a given muzzle velocity and atmospheric conditions. After getting a good zero at 100 yards, add the bullet's drop at 100 yards (from the software) to the scope height above the bore; let's say it's 3 inches. Adjust the scope's elevation down whatever it takes to move the reticule exactly 3 inches down. Now your scope's "ballistically" bore sighted to the rifle. Next, move the elevation adjustment the number of clicks to move impact up 303 inches at 800 yards. If one click's worth .2353 MOA, you'll need to come up 37.875 MOA or 161 clicks. Each click moves impact 1.8825 inch, 303 divided by 1.8825 is 161. Go shoot at 800 yards. If your not right on in elevation for the atmospheric conditions at the range, one or more of the following's not good: * The actual range to the target * Ballistic software * BC for the bullet * Muzzle velocity * Atmospheric conditions entered I've used Sierra Bullets' software for .308 Win. .30-06, and two 30 caliber magnums with different bullet weights and velocities on rifles with sights having ajustments per click of .2 MOA to .6 MOA testing at 600 and 1000 yards. Calculating sight settings using the above method's put first shot within 1/2 MOA of perfect elevation for each. I think the reason is Sierra's software uses 3 to 5 BC's for their bullets that's been determined by actual firing tests measuring time of flight between two points. Shooter software uses only 1 BC for each bullet and I don't think that's going to produce data as reliable as software using BC's the bullet actually has at different speeds through the air. [/QUOTE]
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