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Shooting up hill/ Shooting down hill?
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<blockquote data-quote="Buffalobob" data-source="post: 501325" data-attributes="member: 8"><p>The methods involved in shooting uphill and downhill can be placed in five categories</p><p></p><p></p><p>1. Do nothing and compensate for nothing. The least accurate of all methods but acceptable for ranges under 300 yards or so for deer and larger animals where you have an accurate rifle and a clear shot.</p><p></p><p>2. The Riflemans' method which involves measuring the distance and the angle and multiplying they cosine of the angle times the distance and then looking up the drop and for the modified distance. A significant improvement over doing nothing for the intermediate ranges.</p><p></p><p>3. Improved Riflemans' method which involves measuring the distance and the angle just as before but this time look up the drop and for the measured distance and then multiply the cosine times the drop and use the modified drop. A significant improvement over the rifleman's method and requires no more math and nor more steps and no more time to perform. Increase in accuracy of the method over the older Rifleman's method is about 50% depending on range, cartridge and angle.</p><p></p><p>4. The Sierra Bullets method which is reasonably as accurate as most of us can shoot and see the results. "Load" ran the numbers out for us so you can go back and look at his numbers.</p><p></p><p>5. Good ballistics programs such as JBM, Exbal, Whatever Bryan Litz did, Gustavo's program which I believe is called Loadbase, and some others which I am not familiar with. But not all ballistics programs are worth having and you should be sure you are getting a rigorously correct calculation with your particular program. These programs may or may not use the Sierra method.</p><p></p><p>In summary, the Riflemans method is less accurate and no faster and no simpler than the Improved Riflemans method. You get increased accuracy for the same amount of work by working with the drop instead of distance.</p><p></p><p>A couple of years ago my son was home for Thanksgiving and we went deer hunting with the 40X in 308 that he has used many time in shooting 1000 yard F-class competition. The rifle will shoot groups ranging from 0.19 to 0.4 MOA all day long and average of about 0.35 (I'm not a great shot myself). A six point buck showed up at a range of 265 yards and a angle of perhaps 20+ degrees. The lower half of the bucks chest was obscured by a limb so he had only a 2.0 MOA target. I gave him no correction for angle as it was simply not needed with his skill, the accuracy of the rifle and load and the range and the size of the target. The morale of the story is I have hunted a long time and there is a time to compensate and different ways to compensate and we have to understand our rifles behave accordingly.</p><p></p><p>Two other points for the first time readers.</p><p></p><p>Shooting uphill and downhill is different for two reasons.</p><p></p><p>1. For long range shots, the air density will change with altitude and affect the resistance the bullet incurs.</p><p>2. Gravity is real and only works in one direction. </p><p></p><p>Both of these effects are small but I often will use them to ridicule the internet experts.</p><p></p><p>In conclusion I will say that while I still love my fellow man, my tolerance of stupidity has decreased in direct relationship with the amount of hair I still have left on my head.</p></blockquote><p></p>
[QUOTE="Buffalobob, post: 501325, member: 8"] The methods involved in shooting uphill and downhill can be placed in five categories 1. Do nothing and compensate for nothing. The least accurate of all methods but acceptable for ranges under 300 yards or so for deer and larger animals where you have an accurate rifle and a clear shot. 2. The Riflemans’ method which involves measuring the distance and the angle and multiplying they cosine of the angle times the distance and then looking up the drop and for the modified distance. A significant improvement over doing nothing for the intermediate ranges. 3. Improved Riflemans’ method which involves measuring the distance and the angle just as before but this time look up the drop and for the measured distance and then multiply the cosine times the drop and use the modified drop. A significant improvement over the rifleman’s method and requires no more math and nor more steps and no more time to perform. Increase in accuracy of the method over the older Rifleman’s method is about 50% depending on range, cartridge and angle. 4. The Sierra Bullets method which is reasonably as accurate as most of us can shoot and see the results. “Load” ran the numbers out for us so you can go back and look at his numbers. 5. Good ballistics programs such as JBM, Exbal, Whatever Bryan Litz did, Gustavo’s program which I believe is called Loadbase, and some others which I am not familiar with. But not all ballistics programs are worth having and you should be sure you are getting a rigorously correct calculation with your particular program. These programs may or may not use the Sierra method. In summary, the Riflemans method is less accurate and no faster and no simpler than the Improved Riflemans method. You get increased accuracy for the same amount of work by working with the drop instead of distance. A couple of years ago my son was home for Thanksgiving and we went deer hunting with the 40X in 308 that he has used many time in shooting 1000 yard F-class competition. The rifle will shoot groups ranging from 0.19 to 0.4 MOA all day long and average of about 0.35 (I’m not a great shot myself). A six point buck showed up at a range of 265 yards and a angle of perhaps 20+ degrees. The lower half of the bucks chest was obscured by a limb so he had only a 2.0 MOA target. I gave him no correction for angle as it was simply not needed with his skill, the accuracy of the rifle and load and the range and the size of the target. The morale of the story is I have hunted a long time and there is a time to compensate and different ways to compensate and we have to understand our rifles behave accordingly. Two other points for the first time readers. Shooting uphill and downhill is different for two reasons. 1. For long range shots, the air density will change with altitude and affect the resistance the bullet incurs. 2. Gravity is real and only works in one direction. Both of these effects are small but I often will use them to ridicule the internet experts. In conclusion I will say that while I still love my fellow man, my tolerance of stupidity has decreased in direct relationship with the amount of hair I still have left on my head. [/QUOTE]
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