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Tennessee Gun Owners Forums
Optics
Hitting high, scope bottomed out
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<blockquote data-quote="Hunter 257W" data-source="post: 4510844" data-attributes="member: 12277"><p>That is a good point. Just to see what effect it would have on the point of impact to change the sight height relative to the bore line I've been playing around with the Hornady Bullets website Ballistic Calculator using 308 Marlin Express numbers. Specifically the Leverevolution ammo with the 160 grain bullet (Bc = .395) at 2,660 ft/sec.</p><p></p><p> I experimented with the zero range until I got a 100 yard point of impact close to what Recurve started with, which is 3 " high at 100 yards. I got 3.5" high at 100 with a 275 yard Zero. Surprisingly it does show that load at 4.1" High still at 200 yards. Not quite as extreme as what he got but the fact that it is higher at 200 than it was at 100 with this cartridge surprised me.</p><p></p><p> Now if you drop the scope back down to a more common 1.5" above the bore, and Zero so that you hit about 3" high at 100 yards, it is just 1.4" high at 200 yards. Also the Zero range changes to 225 yards.</p><p></p><p> Sight Height makes quite a difference.</p></blockquote><p></p>
[QUOTE="Hunter 257W, post: 4510844, member: 12277"] That is a good point. Just to see what effect it would have on the point of impact to change the sight height relative to the bore line I've been playing around with the Hornady Bullets website Ballistic Calculator using 308 Marlin Express numbers. Specifically the Leverevolution ammo with the 160 grain bullet (Bc = .395) at 2,660 ft/sec. I experimented with the zero range until I got a 100 yard point of impact close to what Recurve started with, which is 3 " high at 100 yards. I got 3.5" high at 100 with a 275 yard Zero. Surprisingly it does show that load at 4.1" High still at 200 yards. Not quite as extreme as what he got but the fact that it is higher at 200 than it was at 100 with this cartridge surprised me. Now if you drop the scope back down to a more common 1.5" above the bore, and Zero so that you hit about 3" high at 100 yards, it is just 1.4" high at 200 yards. Also the Zero range changes to 225 yards. Sight Height makes quite a difference. [/QUOTE]
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Hitting high, scope bottomed out
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