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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Help calculating yardage when shooting at angles
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<blockquote data-quote="DocUSMCRetired" data-source="post: 1117524" data-attributes="member: 85458"><p>While the rifleman's rule, and improved rifleman's rule can get you close. These are good for getting an approximate. It is technically slightly more complicated than that. Chapter 4 of Bryan Litz book Applied Ballistics for Long Range Shooting covers this, and why. Here are just a couple of pointers to consider. </p><p></p><p>1. "First, the range scaling ignores the effect of the bullet slowing down as it travels thru all the air between the shooter and the target." - Bryan Litz</p><p></p><p>2. Second, range scaling ignores the effect of the gravity that's either acting to decrease or maintain the bullets speed." - Bryan Litz</p><p></p><p>3. In addition range scaling does not distinguish between uphill and downhill shooting" - Bryan Litz. </p><p></p><p>4. "Improved Rifleman's Rule - You must be working from a relatively short range zero like 100 yards. If you get an inclined shot at 600 yards, the improved rifleman's rule wont indicate any correction" - Bryan Litz</p><p></p><p>Example Table. 155 Grain, .308 fired at 3000 fps at a range of 1000 yards, with a 100 yard zero:</p><p></p><p>Look Angle - Drop</p><p>0 Degrees -309.9"</p><p></p><p>+5 Degrees -309.3"</p><p>-5 Degrees -307.9"</p><p></p><p>+40 Degrees -233.7"</p><p>-40 Degrees -225.5"</p><p></p><p>+45 Degrees -213.5"</p><p>-45 Degrees -205.2"</p><p></p><p>This is fully covered in Chapter 4 of Applied Ballistics for Long-Range Shooting. Including the use of tools. <a href="http://store.appliedballisticsllc.com/ProductDetails.asp?ProductCode=0001" target="_blank">Applied Ballistics For Long Range Shooting 2nd Edition</a></p></blockquote><p></p>
[QUOTE="DocUSMCRetired, post: 1117524, member: 85458"] While the rifleman's rule, and improved rifleman's rule can get you close. These are good for getting an approximate. It is technically slightly more complicated than that. Chapter 4 of Bryan Litz book Applied Ballistics for Long Range Shooting covers this, and why. Here are just a couple of pointers to consider. 1. "First, the range scaling ignores the effect of the bullet slowing down as it travels thru all the air between the shooter and the target." - Bryan Litz 2. Second, range scaling ignores the effect of the gravity that's either acting to decrease or maintain the bullets speed." - Bryan Litz 3. In addition range scaling does not distinguish between uphill and downhill shooting" - Bryan Litz. 4. "Improved Rifleman's Rule - You must be working from a relatively short range zero like 100 yards. If you get an inclined shot at 600 yards, the improved rifleman's rule wont indicate any correction" - Bryan Litz Example Table. 155 Grain, .308 fired at 3000 fps at a range of 1000 yards, with a 100 yard zero: Look Angle - Drop 0 Degrees -309.9" +5 Degrees -309.3" -5 Degrees -307.9" +40 Degrees -233.7" -40 Degrees -225.5" +45 Degrees -213.5" -45 Degrees -205.2" This is fully covered in Chapter 4 of Applied Ballistics for Long-Range Shooting. Including the use of tools. [url=http://store.appliedballisticsllc.com/ProductDetails.asp?ProductCode=0001]Applied Ballistics For Long Range Shooting 2nd Edition[/url] [/QUOTE]
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Help calculating yardage when shooting at angles
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