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pctyler
Optics GrassHopper Joined: June/28/2011 Location: florida Status: Offline Points: 3 |
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Posted: August/26/2011 at 11:11 |
I got a 40 yard shooting range, Thompson Venture in 7mm-08(130gr.) and Leupold 3-9X40mm..........if I zero this set up dead on at 40 yards, where will it hit at 100 yards? where is a good resource online for this info? thanks for the help...
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sweethomeala
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Bigdaddy0381
MODERATOR Georgia peach Joined: February/27/2007 Location: Georgia Status: Offline Points: 13682 |
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you will hit high @100, if i'm not mistaken. You should be about 1 inch low at 40 to have 100 or close to 100 zero.
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300S&W
Optics God Joined: January/27/2008 Location: Burlington,WV Status: Offline Points: 10592 |
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WELCOME to OT,pc. You'll need more info than you provided but this is a pretty simple ballistics program. I figured at 3000fps with a BC of .40 sighted in at 40yds and got +.99" at 100yds. http://www.handloads.com/calc/ I got -.4 at 40yds when dead on at 100yds using my info. BUT you'll need your specifics to know for sure. Edited by 300S&W - August/26/2011 at 11:31 |
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jonoMT
Optics Master Extraordinaire Joined: November/13/2008 Location: Montana Status: Offline Points: 4853 |
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You can use a ballistics calculator like JBM (http://www.jbmballistics.com/cgi-bin/jbmtraj_drift-5.1.cgi) to play around with different zeros...although be warned that you need to get the right data entered in the first place. But Bigdaddy is in the ballpark on what is likely the drop at 40 vs. 100 yards. When you fire, the bullet's trajectory related to the sight starts out low (the distance of the sight height* over the center of the barrel), arcs upwards (slightly, given the overall distance of flight) and then drops down. At whatever range it crosses the center of the sight is the zero.
To end up with a 100-yard zero using a 40 yard range, you'll have to make sure that your shots are hitting 1/2 to 1 inch lower than your point of aim. Even then, it will be an approximation. Theoretically, I could zero my .308 for 200 yards by shooting a zero @ 35 yards. But I wouldn't depend on it in the field. *The best way I know of to measure the sight height is if you have a dial caliper, measure the width of the barrel right below the scope bell. Add that to the width of the scope bell, then divide that by 2 and add the distance between the scope bell and the top of the barrel. |
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Reaction time is a factor...
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pctyler
Optics GrassHopper Joined: June/28/2011 Location: florida Status: Offline Points: 3 |
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Thanks for the info!
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sweethomeala
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