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> Vortex scope turret calibration
Vortex scope turret calibration
@ 05:15 pm (GMT) |
Nathan FosterModel: Viper HS 4-16x50 LR Riflescope {1/4 m.o.a.}Turret travels 1.241 MOA per advertised MOA of travel. In other words, 4 clicks yields 1.241 MOA or 1.299" That should save a few of you some headaches doing the math. |
Replies
@ 10:57 pm (GMT) |
Allen MillerRe: Vortex scope turret calibrationHow did you like the Vortex otherwise? |
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@ 12:24 am (GMT) |
Nathan FosterRe: Vortex scope turret calibrationThe client is in California Allen, it was a buddy job like yours. He is very happy. Funny though, the scopes are mostly advertised as half minute elevation increments, quarter minute windage. But this one is a quarter quarter. The client did the range testing, I did the drop charts, everything is bang on at long range. Very happy (deadly) hunter.There are 2 MOA spaced hash marks on the reticle that can be used for windage rather than dialing. I never calibrated the chart for the drop hash marks, just windage. So the client's chart has wind in MOA, feet and BDC reticle hash marks. |
@ 10:17 pm (GMT) |
Jim MoseleyRe: Vortex scope turret calibrationI have that scope on my 243. Seems to do a great job, so far. Can't beat the warranty on their scopes and a great bang for the bucks too. |
@ 08:31 am (GMT) |
Michael NeesonRe: Vortex scope turret calibrationI have been looking at the Vortex recently myself and having the whole "milrad or MOA" internal debate and noticed something interesting. If my math is correct, Nathans test shows 1.299" at 100 yards, then it moves approx 1.42" at 100m (109y)? 1.299 x 1.09 = 1.42" If this is correct then 1.42" x 25.4 = 36mm... very close to 4cm at 100m... which makes me wonder if it actually has a milrad workings...Please let me know if I am wrong. My math can be appalling sometimes. AND if I am right then it might be better to go milrad/mildot and not kid yourself? ;-) |
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@ 02:39 pm (GMT) |
Nathan FosterRe: Vortex scope turret calibrationHi Mike, your math is correct. I came up with 36.25mmThe trouble is, by the time the shooter dials up 8 clicks, the scope will already be out by 7.5mm or roughly .25 MOA. The higher the shooter dials, the greater the error. This is not acceptable. Nevertheless, it is sometimes possible to get away with some error if using a magnum powered rifle at ranges inside 600 yards. But in these instances, it still pays to do the math and actually observe what measure of error will be expected, then limit ranges accordingly. In cartridges with a steep trajectory like your .308, this level of error is as suggested, unacceptable. It is also important to understand that the client who owns this scope is in the U.S. His local range is in yards, his range finder in yards. Most U.S ballistics software is in yards and MOA. Furthermore, 1/4 MOA is a finer increment than 1cm clicks. Even if the scope was true to CM, the drop charts would have to be made using Microsoft Excel, using the ballistics software MOA input, then converting to CM output and chart generation. In this case, converting directly to metric without factoring error would involve a pile of math for an incorrect output. For the above client, I used Excel to generate an accurate re-calibrated chart so that when the client dialed, he was on the money. Recently, the client achieved his long term goal of securing a large Wyoming Mule buck at high elevation. It was a dream come true for him. I had to generate two charts for the client, a foothill chart and an alpine chart- two charts to cover his needs, averaged accordingly with potential errors noted. Hope that all makes sense. |
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@ 09:17 pm (GMT) |
Michael NeesonRe: Vortex scope turret calibrationAbsolutely makes sense, it just looked to me that to save in manufacturing costs, Vortex are changing the knobs/dials on the scopes and not necessarily the workings.I'm not saying that's bad either, just an interesting approach (if true). Once a tall target test is done (so I have learned) it doesn't matter what the knobs say. I recently did a tall target test on my Burris Euro Diamond 3-10x and it's elevation adjustments are horrendous, instead of the .25" per click it works out to be an average .295" per click for the first 40 clicks and then an average of .260" per click for the next 40 clicks up. The clicks are quite firm and precise initially, but then fade as the knob is turned through half a revolution and then slowly become firm a precise again. I guess it kinda feels like when you try screwing in a slightly bent screw. It makes me wonder if I need to send it back. Any thoughts? Hence I was looking at the Vortex or Sightron S111... I have managed to find an Aussie dealer that sells the Vortex at a competitive price so rather than get a Sightron from the states, get the Vortex locally. All our ranges here are in meters unfortunately hence the debate I am having with myself... and now others. |
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@ 11:22 pm (GMT) |
Nathan FosterRe: Vortex scope turret calibrationSightron are well represented in Australia with a solid importer (Herrons).If you want metric, go with the SIII 6-24x50 Mil rad unit. This is a robust and ultra precise scope. |
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