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 Using the elevation turret properly
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Gw hunter
Junior Member



41 Posts

Posted - Jul 25 2017 :  17:02:37  Show Profile Send Gw hunter a Private Message  Reply with Quote
I finally swapped out my 35 year old 3-9x40 Leupold for a Vortex Viper HS in 4-16x44. Now I'm trying to understand the correct use of the elevation turret. So for example.... (using Barnes manual #4 with a B.C. of .390) My muzzle velocity is 3300'/sec. If my zero is at 100 yds, then at 400 yds my P.O.I. is 21.20" low, basically 21"... To have my P.O.I. dead on at 400 do I raised the elevation 84 clicks (1/4" per click)? I'm confused because if my zero is 300 yds then I would be 3" high at 100 and 9" low at 400 yds. Do I then raise the elevation 36 clicks from there? The numbers don't make sense to me when you compare the different zero points. Any input would be appreciated. Thanks

Onondaga
Advanced Member



USA
4041 Posts

Posted - Jul 25 2017 :  17:52:48  Show Profile Send Onondaga a Private Message  Reply with Quote
Gw hunter

NO, You are wrong. The click equals 1/4' only @ 100 yards and the effect is linear. At 200 yards a click equals 1/2 inches and at 400 yards a click equals 1 inch. Likewise at 50 yards a click equals 1/8" and at 25 yards a click equals 1/16 inch. This is simple linear mathematics.

Gary

Fine rifles are never really owned.

Edited by - Onondaga on Jul 25 2017 17:56:02
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Gw hunter
Junior Member



41 Posts

Posted - Jul 25 2017 :  17:54:09  Show Profile Send Gw hunter a Private Message  Reply with Quote
Just realized the disconnect... 1/4" per click at 100 equals 1" at 400... the numbers do make sense now.
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Shastaboat
Advanced Member



USA
9148 Posts

Posted - Jul 25 2017 :  18:25:54  Show Profile Send Shastaboat a Private Message  Reply with Quote
quote:
Originally posted by Onondaga

Gw hunter

NO, You are wrong. The click equals 1/4' only @ 100 yards and the effect is linear. At 200 yards a click equals 1/2 inches and at 400 yards a click equals 1 inch. Likewise at 50 yards a click equals 1/8" and at 25 yards a click equals 1/16 inch. This is simple linear mathematics.

Gary





Good post Gary.
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caveman0101
Senior Member



USA
238 Posts

Posted - Jul 25 2017 :  18:33:45  Show Profile Send caveman0101 a Private Message  Reply with Quote
Do yourself a favor and once you know what bullet your going to shoot and the muzzle velocity, get a custom turret made. They only cost about $85 dollars then it's just range, turn turret to correct yardage and bang. But don't use book info actually shot your gun through chrony. And another thing there are several great hunting bullets with much better B.C. It will save a lot of clicks at long range.

"It is better to remain silent and be thought a fool than to speak and remove all doubt" Lincoln/Twain
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mtmuley
Advanced Member

USA
1824 Posts

Posted - Jul 25 2017 :  19:44:00  Show Profile Send mtmuley a Private Message  Reply with Quote
I'm assuming your turret is marked in MOA? mtmuley
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Gw hunter
Junior Member



41 Posts

Posted - Jul 26 2017 :  03:00:59  Show Profile Send Gw hunter a Private Message  Reply with Quote
Yes it's MOA. I've got it now. I'm aware that MOA is linear, I guess I just had a senior moment while looking at the ballistic data of different zero ranges and how they compare. I do chrony all of my loads so I use book data as just a reference. I
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mtmuley
Advanced Member

USA
1824 Posts

Posted - Jul 26 2017 :  08:06:28  Show Profile Send mtmuley a Private Message  Reply with Quote
Zero your rifle at whatever range you choose, then use a ballistics program to print a chart for the adjustments in MOA at furthe yardages. mtmuley
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Zero333
Advanced Member



Canada
826 Posts

Posted - Jul 26 2017 :  20:13:51  Show Profile Send Zero333 a Private Message  Reply with Quote
100 yard zero, 0.39 bc, 3,300 fps, 400 yard dope =

5 moa = 20 clicks on scope with 1/4 moa clicks.... or

1.5 milliradians (Mrads, Mils) = 15 clicks on a scope with Mrad turrets.





Treat that trigger like it’s your first date, not like you’ve been married to it for 20 years.

Edited by - Zero333 on Jul 26 2017 20:14:34
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Rapier
Advanced Member



USA
794 Posts

Posted - Aug 08 2017 :  09:36:50  Show Profile Send Rapier a Private Message  Reply with Quote
The very first error many shooters, that have little or no experience with long distance shooting make is assuming the scope elevation data as given on the box or spec sheet from the factory is accurate data. 99.99% of the time those numbers are pure estimates. If you want to shoot varying distances and longer distances, with heaven forbid, using the scope adjustments knobs, first determine what the actual adjustments are for each knob, elevation and windage knobs both. Remember to take the backlash out and to always return to zero when you stop shooting for the day.
Ed

Life is simpler when you plow around the stump.

"Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery? Forbid it, almighty God! I know not what course others may take, but as for me, give me liberty, or give me death!"
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