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Hunting
Long Range Hunting & Shooting
Gun build - Scope help PLEASE
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<blockquote data-quote="MontanaRifleman" data-source="post: 494094" data-attributes="member: 11717"><p>I used to zero my rifles at 300 yds with MV's of 3400 fps until I read in a recent thread that environmental conditions could change your zero POI (which actually changes your zero distance), which in turn changes your down range POI because all your data is based on your zero distance. In a 300 WM a pressure altitude difference of 5000' will change your 500 yd POI elevation by about 2" which is going to throw off eveything down range by larger margins. If you shoot and hunt at ranges lesss than 500 yds, I see no benefit from zeroing @ 500 yds. Depending on your load and scope hieght, your trajectory inside 500 yds could reach about 18" above line of sight. With my rifles, I now zero @ 200 yds, which only change by about 0.2" with an 8000' ft pressure altitude change.</p><p></p><p>IMO, there's no reason not to get a 20 MOA canted base unless your scope has less than enough travel to to zero with a 20 MOA base, which shouldn't be an issue with the Viper. Without it, 1K shooting might be iffy, and if he ever decides to shoot at longer ranges in the future, his uncanted base will be useless.</p><p></p><p>Objective size doesn't affect FOV. If you look at the specs of the Vipers in 44mm and 50mm, you'll see that their FOV's are the same. Same holds true for Nightforce scopes.</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 494094, member: 11717"] I used to zero my rifles at 300 yds with MV's of 3400 fps until I read in a recent thread that environmental conditions could change your zero POI (which actually changes your zero distance), which in turn changes your down range POI because all your data is based on your zero distance. In a 300 WM a pressure altitude difference of 5000' will change your 500 yd POI elevation by about 2" which is going to throw off eveything down range by larger margins. If you shoot and hunt at ranges lesss than 500 yds, I see no benefit from zeroing @ 500 yds. Depending on your load and scope hieght, your trajectory inside 500 yds could reach about 18" above line of sight. With my rifles, I now zero @ 200 yds, which only change by about 0.2" with an 8000' ft pressure altitude change. IMO, there's no reason not to get a 20 MOA canted base unless your scope has less than enough travel to to zero with a 20 MOA base, which shouldn't be an issue with the Viper. Without it, 1K shooting might be iffy, and if he ever decides to shoot at longer ranges in the future, his uncanted base will be useless. Objective size doesn't affect FOV. If you look at the specs of the Vipers in 44mm and 50mm, you'll see that their FOV's are the same. Same holds true for Nightforce scopes. [/QUOTE]
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Gun build - Scope help PLEASE
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