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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Slope/Angle ballistics (again!)
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<blockquote data-quote="Darryl Cassel" data-source="post: 21978" data-attributes="member: 34"><p>Dave</p><p></p><p>If you use a longer distance to look at the difference of the drops it may become more clear if your trying to find out what I think your trying to find out.</p><p></p><p>Figuring that the bullet will shoot HIGH with a 45 degree angled shot, use 1000 yards and 750 yards as your base distance.</p><p></p><p>At 1000 yds with a 45 degree shot and using the 338gr 250 gr Bullet at 3250 FPS you will need 12.5 MOA from a 100 yd zero. The bullet path will be -131.26". Now lower that 1000 yards down to a 0 degree or flat straight away shot and you would need 18.5 MOA or </p><p> -93.23". A difference of 6 MOA just by flattening the angle of the shot.</p><p></p><p>Now go to 750 Yards and do the same thing. At 45 degrees you will need 7.4 MOA </p><p>(-57.94") and at 0 degrees of flat land shooting you will need 11.2 MOA(88.13") </p><p></p><p>Now comparing the 1000 yard 45 degree shot with the 750 yard 0 degree or flat land shot, you would have to take off ONLY 1.3 MOA to shoot at the 750 yard target. </p><p></p><p>The only reason I went with the 1000 yard and the 750 is because of the comparison of your 200 to your 141 yard shot.</p><p></p><p>The gravitational let up on a 45 degree shot is more then some think.</p><p></p><p>I'm not clear on what you said about being low with your 141 yard shot if your shooting at something 200 yards away and sighted in at that 200 yard target and on a 45 degree angle to start with??? </p><p></p><p>I just ran the same bullet from above at 200 yards at 45 degrees and the 141 Yard shot at 0 degrees. At 200 yards with the 45 degree shot, if the rifle had a 100 yard zero (on flat ground), you would be on at the 200 yard mark (WITHOUT ANY ELEVATION CHANGE) also because of the lessor amount of gravitational pull.</p><p>Now go back to the 141 yard mark on a flat ground or 0 degree and your bullet path will be ONLY -.02" low or the SAME MOA as the 200 yard 45 degree shot was. That means it will shoot the same at the two distances. </p><p></p><p>The main factor is the 45 degree shot and I'm still not sure if that was your original question. The flight difference between a 200 yard and 141 or 150 yards when one is 45 degrees and the other is 0 degrees is not very much. It will show up a little bit more when you take the yardage out further but will still be close because of the 45 degree shot.</p><p></p><p>This is what my ballistics program just told me but, I'm still not sure if that's what you were after???? </p><p></p><p>My question is, how many 45 degree shots would you have at 200 yards and then come back to 0 degrees for a 141 yard shot? If you were shooting 45 degrees and only 200 yards distance, I doubt if there would be an animal able to stand on that steep hill?</p><p></p><p>Darryl</p><p> <img src="http://images/icons/smile.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>[ 02-21-2002: Message edited by: Darryl Cassel ]</p></blockquote><p></p>
[QUOTE="Darryl Cassel, post: 21978, member: 34"] Dave If you use a longer distance to look at the difference of the drops it may become more clear if your trying to find out what I think your trying to find out. Figuring that the bullet will shoot HIGH with a 45 degree angled shot, use 1000 yards and 750 yards as your base distance. At 1000 yds with a 45 degree shot and using the 338gr 250 gr Bullet at 3250 FPS you will need 12.5 MOA from a 100 yd zero. The bullet path will be -131.26". Now lower that 1000 yards down to a 0 degree or flat straight away shot and you would need 18.5 MOA or -93.23". A difference of 6 MOA just by flattening the angle of the shot. Now go to 750 Yards and do the same thing. At 45 degrees you will need 7.4 MOA (-57.94") and at 0 degrees of flat land shooting you will need 11.2 MOA(88.13") Now comparing the 1000 yard 45 degree shot with the 750 yard 0 degree or flat land shot, you would have to take off ONLY 1.3 MOA to shoot at the 750 yard target. The only reason I went with the 1000 yard and the 750 is because of the comparison of your 200 to your 141 yard shot. The gravitational let up on a 45 degree shot is more then some think. I'm not clear on what you said about being low with your 141 yard shot if your shooting at something 200 yards away and sighted in at that 200 yard target and on a 45 degree angle to start with??? I just ran the same bullet from above at 200 yards at 45 degrees and the 141 Yard shot at 0 degrees. At 200 yards with the 45 degree shot, if the rifle had a 100 yard zero (on flat ground), you would be on at the 200 yard mark (WITHOUT ANY ELEVATION CHANGE) also because of the lessor amount of gravitational pull. Now go back to the 141 yard mark on a flat ground or 0 degree and your bullet path will be ONLY -.02" low or the SAME MOA as the 200 yard 45 degree shot was. That means it will shoot the same at the two distances. The main factor is the 45 degree shot and I'm still not sure if that was your original question. The flight difference between a 200 yard and 141 or 150 yards when one is 45 degrees and the other is 0 degrees is not very much. It will show up a little bit more when you take the yardage out further but will still be close because of the 45 degree shot. This is what my ballistics program just told me but, I'm still not sure if that's what you were after???? My question is, how many 45 degree shots would you have at 200 yards and then come back to 0 degrees for a 141 yard shot? If you were shooting 45 degrees and only 200 yards distance, I doubt if there would be an animal able to stand on that steep hill? Darryl [img]images/icons/smile.gif[/img] [ 02-21-2002: Message edited by: Darryl Cassel ] [/QUOTE]
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