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40 yard shooting range

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pctyler View Drop Down
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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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bigdaddy0381 Quote  Post ReplyReply Direct Link To This Post Posted: August/26/2011 at 11:17
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote 300S&W Quote  Post ReplyReply Direct Link To This Post Posted: August/26/2011 at 11:25

 

 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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Post Options Post Options   Thanks (0) Thanks(0)   Quote jonoMT Quote  Post ReplyReply Direct Link To This Post Posted: August/26/2011 at 11:52
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote pctyler Quote  Post ReplyReply Direct Link To This Post Posted: August/26/2011 at 15:33
Thanks for the info!
sweethomeala
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