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MOA and dial spinning, need schooling. #14892361 05/19/20
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Correct me at any time if I am wrong. A 4 MOA gong at 200 yards would be 8"x8". Suppose I am sighted in for 300 yards and my bullet would hit 16 inches low at 400yards, to bring the bullet up the 16 inches I would turn the turret counter clockwise 16 clicks (1/4 MOA clicks) right? This said true MOA is a bit bigger than 1", 1.047 to be exact. Are the adjustments on scopes actual MOA or are they 1."? Or if I were trying to bring my POI up say 60 inches at 700 yards each click being approximately 1.75" I would need to turn the turret 34-35 clicks counter clockwise? The scope in question being a SWFA 10x42 Classic with MOA turrets.

Last edited by rickt300; 05/19/20.
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Re: MOA and dial spinning, need schooling. [Re: rickt300] #14892408 05/19/20
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You're on the right track but stop thinking clicks and start thinking MOA, like the numbers on your turret.


Steve
Re: MOA and dial spinning, need schooling. [Re: rickt300] #14892449 05/19/20
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The scope adjustments are supposed to be MOA, but that needs to be measured and confirmed. The biggest favor you can do for yourself is to get a SWFA 10x42 with matching MOA reticle and turret (or matching in MRAD), and simply use the reticle to measure how low your shot lands. Then dial this number into the turret. Given your current scope, you can use the mil-dot reticle to measure how low your shot is and multiply that by 3.438 to get the number of MOA to dial into the turret. If you insist on using inches (the most complicated and least effective way to do it), then you can take the distance of the POI from the POA, divide that by the distance in yards, times by 100, divide by 1.047, and dial that into your elevation turret.

If you need to come up 16" at 400 yards, then

16" / 400 * 100 / 1.047 = 3.82 MOA

So if your turret is set to "0" with your 300 yard zero, then simply dial up to 3.75 MOA ("3" plus 3 clicks).

If you need to come up 60" at 700 yards, then

60" / 700 * 100 / 1.047 = 8.19 MOA

So dial from "0" to 8.25 MOA ("8" plus 1 click).

Re: MOA and dial spinning, need schooling. [Re: rickt300] #14892829 05/19/20
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Cool thanks for the info.

Re: MOA and dial spinning, need schooling. [Re: rickt300] #14893363 05/19/20
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jbmballistics.com is a good place to get familiar with.

IC-A

Re: MOA and dial spinning, need schooling. [Re: rickt300] #14893859 05/19/20
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Excellent site!

Re: MOA and dial spinning, need schooling. [Re: rickt300] #14894727 05/20/20
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Hold steady on the target, dial to the hit and shoot.

Re: MOA and dial spinning, need schooling. [Re: rickt300] #14901055 05/22/20
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Much can be learned by reading!


"There ain't no freedom....without gunpowder!"
Re: MOA and dial spinning, need schooling. [Re: rickt300] #14907459 05/24/20
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Well done some reading, extrapolated some data and played with the scope now on a 243 to test it. I like the scope a lot other than it's weight and I need to get used to the windage knob sticking out so far to the right. All I need to so now is do some more load testing and head out to the range, hoping for first round hits out to 600 yards ( as long as there is lead in the air there's hope).

Re: MOA and dial spinning, need schooling. [Re: rickt300] #15009393 06/29/20
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What are you shooting?
220gr. RN?

Or is this a theoretical numbers game?

(Just looked at a table of trajectory data out of curiosity)


-OMotS



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Quote: ( unnamed) "been prtty deep in the cooler todaay "
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Re: MOA and dial spinning, need schooling. [Re: rickt300] #15009621 06/29/20
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Originally Posted by rickt300
Correct me at any time if I am wrong. A 4 MOA gong at 200 yards would be 8"x8". Suppose I am sighted in for 300 yards and my bullet would hit 16 inches low at 400yards, to bring the bullet up the 16 inches I would turn the turret counter clockwise 16 clicks (1/4 MOA clicks) right? This said true MOA is a bit bigger than 1", 1.047 to be exact. Are the adjustments on scopes actual MOA or are they 1."? Or if I were trying to bring my POI up say 60 inches at 700 yards each click being approximately 1.75" I would need to turn the turret 34-35 clicks counter clockwise? The scope in question being a SWFA 10x42 Classic with MOA turrets.


Zero at 100. Enter data in JBM at 700 yards using Litz measured BC profile, if Litz data isn’t available reduce BC by 10%. Shoot a group at 700 and confirm dope, find dial MOA or MiLS that equal your elevation at 700. Go back to JBM and tweak velocity so drop matches reality. Print dope on paper, and make cards for elevation you will be shooting at if it’s different from you zero elevation. Done. Never....count....clicks....again. Range , read dope chart, dial and shoot. Done.

Unless you are shooting past 700 yards.


Sean
Re: MOA and dial spinning, need schooling. [Re: rickt300] #15009874 06/30/20
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Why count clicks if you shoot past 700 yards? Not many critters will stand still long enuff to count that frigging many clicks....

Re: MOA and dial spinning, need schooling. [Re: rickt300] #15012852 07/01/20
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applied ballistic is another good calculator

Re: MOA and dial spinning, need schooling. [Re: rickt300] #15012932 07/01/20
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You guys are zeroing at 100? What's the benefit over picking 100 zero over a 200 zero for rounds that shoot as flat as a 243 for non-caliber-specific dials? I've been using a 200 zero. Haven't seen any problems. I'm usually an inch high at 100, which is not a hamper to hitting anything I shoot at.


I belong on eroding granite, among the pines.
Re: MOA and dial spinning, need schooling. [Re: rickt300] #15015304 07/02/20
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Easier to find a place to confirm zero in the field at 100 yards.

Just spin your dial to 200 dope when hunting, presto - same thing.


Sean
Re: MOA and dial spinning, need schooling. [Re: SeanD] #15015536 07/02/20
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Originally Posted by SeanD
Easier to find a place to confirm zero in the field at 100 yards.

Just spin your dial to 200 dope when hunting, presto - same thing.

Ah. Makes sense, but I don't shoot at ranges anymore, so I don't worry about that, and I'd feel retarded dialing for a 200 yd shot. I'll stick with my 200 yd zero.


I belong on eroding granite, among the pines.
Re: MOA and dial spinning, need schooling. [Re: rickt300] #15015771 07/02/20
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Here's an example from real life. I didn't count clicks. I figured 1" equals 1MOA. I dialed the turret up the required amount.

Yesterday, 6/29/20, I took my 8mmCoyle to the range for final zero at 300 yards with the Hammer Hunter 198 grain bullets. I fired three which formed a 3 5/8” group about 3” below aiming point. Perfect. Then I did something with my Bushnell 6500 4 1/2-30X50 Elite that I never tried before. According to JBM I needed to dial up 3 1/2 minutes to hit at 425 yards and 5 1/2 minutes to hit at 500 yards. There is a 10” plate at 423 yards. I twisted 3 1/2 minutes and hit the plate. Then I returned to zero and fired two more which were inside the group. Next I dialed up 5 ½ minutes and hit the 10” plate at 508 yards. Returned to zero and fired two more inside the group. Average velocity from the 24" barrel is 3,054 feet per second. The Weatherby six lug rifle weighs 7 1/4 pounds ready for hunting.

New barrel fired 44 times


"Only Christ is the fullness of God's revelation."
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Re: MOA and dial spinning, need schooling. [Re: Ringman] #15021662 07/04/20
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Originally Posted by Ringman
Here's an example from real life. I didn't count clicks. I figured 1" equals 1MOA. I dialed the turret up the required amount.

Yesterday, 6/29/20, I took my 8mmCoyle to the range for final zero at 300 yards with the Hammer Hunter 198 grain bullets. I fired three which formed a 3 5/8” group about 3” below aiming point. Perfect. Then I did something with my Bushnell 6500 4 1/2-30X50 Elite that I never tried before. According to JBM I needed to dial up 3 1/2 minutes to hit at 425 yards and 5 1/2 minutes to hit at 500 yards. There is a 10” plate at 423 yards. I twisted 3 1/2 minutes and hit the plate. Then I returned to zero and fired two more which were inside the group. Next I dialed up 5 ½ minutes and hit the 10” plate at 508 yards. Returned to zero and fired two more inside the group. Average velocity from the 24" barrel is 3,054 feet per second. The Weatherby six lug rifle weighs 7 1/4 pounds ready for hunting.

New barrel fired 44 times


Outstanding! Agreed on not counting clicks. Have played some with the dials and pretty much have it down now. Still in my case if the wind is much over 10 mph and the distance over 400 yards things are getting a bit dicey.

Re: MOA and dial spinning, need schooling. [Re: rickt300] #15022489 07/04/20
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Wind? For me that ain't happenin'.


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Re: MOA and dial spinning, need schooling. [Re: HuntnShoot] #15025966 07/06/20
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Originally Posted by HuntnShoot
Originally Posted by SeanD
Easier to find a place to confirm zero in the field at 100 yards.

Just spin your dial to 200 dope when hunting, presto - same thing.

Ah. Makes sense, but I don't shoot at ranges anymore, so I don't worry about that, and I'd feel retarded dialing for a 200 yd shot. I'll stick with my 200 yd zero.



I think you missed the point.

Field confirmation (not shooting range) is just a little more convenient. Like say your rifle takes a tumble and you whacked the scope hard on a rock.

Just set it at 0.5 mil/1.5 MOA, or whatever fits your needs so you can shoot as far as makes sense to you without dialing, and leave it there. All the time. Unless you need to dial for a shot farther then your “field zero”. Field zero can be 200, 250, whatever makes sense for your load/conditions.

The bigger point is don’t be messing with dials when you should be shooting game. Dialing up from a 100 zero for a 200 yard shot when an elk is standing there is just silly.


Sean

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