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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
How accurate are angle cosine indicators?
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<blockquote data-quote="Jeff In TX" data-source="post: 17431" data-attributes="member: 1522"><p>OK dinners done and I'm stuff, but I'll try this again.</p><p></p><p>In the first example it was a 600 shot with a 35 degree angle. The cosine distance shows the shot to be a 490 yard shot.</p><p>Using my 308 zeroed at 100 yard and 2700'</p><p>A 490 yard shot with my .308 would have -53.13 inch path (drop).</p><p>A 600 yard shot using a calculated trajectory would have a -71.01 inch path. This gives us a difference of almost 18 inches. The calculated trajectory is taking into consideration the additional bullet flight time which still has gravity pulling on it. </p><p></p><p>Not many shots would fall under this catagory, but it goes to show you just can't use a cosine angle for long range shots. Shot under 300 yards with a 20 angle there isn't much difference, but go over 300 yards and increase the angle and it's a whole new ball game. </p><p></p><p>Now I hope that made since. <img src="http://images/icons/rolleyes.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://images/icons/wink.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>[ 11-27-2003: Message edited by: Jeff In TX ]</p></blockquote><p></p>
[QUOTE="Jeff In TX, post: 17431, member: 1522"] OK dinners done and I'm stuff, but I'll try this again. In the first example it was a 600 shot with a 35 degree angle. The cosine distance shows the shot to be a 490 yard shot. Using my 308 zeroed at 100 yard and 2700' A 490 yard shot with my .308 would have -53.13 inch path (drop). A 600 yard shot using a calculated trajectory would have a -71.01 inch path. This gives us a difference of almost 18 inches. The calculated trajectory is taking into consideration the additional bullet flight time which still has gravity pulling on it. Not many shots would fall under this catagory, but it goes to show you just can't use a cosine angle for long range shots. Shot under 300 yards with a 20 angle there isn't much difference, but go over 300 yards and increase the angle and it's a whole new ball game. Now I hope that made since. [img]images/icons/rolleyes.gif[/img] [img]images/icons/wink.gif[/img] [ 11-27-2003: Message edited by: Jeff In TX ] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
How accurate are angle cosine indicators?
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