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MOA?

 
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  #1  
Old 03-25-2010, 08:53 PM
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MOA?

How many inches is 65 MOA?

joseph
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Old 03-25-2010, 09:47 PM
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Re: MOA?

It depends on a lot of things. 1 MOA at 100 yards is 1 inch. 1 MOA at 600yards is 6 inches. 1 MOA at 1000yards is 10 inches are you following me? When I shoot a mile with my 6-284 rifle with a 107 grain bullet at 3400 fps it takes 56MOA for the bullet to get there. If i shoot my 338-408 at 3300fps and a 300 grain smk it takes 42 MOA to get there. The difference is how flat a rifle shoots at a mile. lets say you are shooting at a 600 yard target that is a 12X12 square. I see your bullet impact 12 inches low and 6 inches to the left im going to call a correction of 2 MOA up and 1 MOA right. This makes for quick corrections when you ard dialing the MOA into your scope.
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Old 03-25-2010, 09:51 PM
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Re: MOA?

So 65 MOA at 100yards is 65 inches. 65 MOA at 200 yards is 130 inches. 65 MOA at 500 yards is 325 inches.
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Old 03-26-2010, 12:01 AM
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Re: MOA?

The drop chart for my bullet is 73" at 600 yards and 286" at 1,000 yds. My scope has 65 MOA of adjustment. Does this mean that I can use a flat Picatinney rail?

joseph
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Old 03-26-2010, 01:01 AM
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Re: MOA?

Maybe not. When the scope manufacturer says 65moa adjustment they mean from top to bottom. After you zero you rifle you'll be somewhere in the middle. You might be closer than 28.6moa, (29.97 real moa) to the top of your adjustment and in that case your SOL for 1000 yard shots.
Get a ramp just so can keep your reticle closer to the middle of your adjustment.
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Old 03-26-2010, 04:11 AM
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Re: MOA?

Quote:
Originally Posted by joseph View Post
How many inches is 65 MOA?

joseph
Joseph, a MOA is an angular measurement, stands for "minutes of angle", so 65 MOA = 65 minutes... think of a huge V and let's say that the exaggerated angle in between is 65 MOA. The longer the V it is, the distance between the ends of the v is greater; and the V still has an angle of 65 moa.

So, we need to specify a distance. Like how many inches holds a MOA AT 775 yards? We know that the true dimension of a moa is: 1MOA = 1.047" at 100 yards. Not 1"; sooner or latter if you use 1" it will get you in trouble and I will show you later.

So, if every 100 yards I have a distance of 1.047, at 775 yards you would have (1.047 x 7.75 = 8.11 inches. ---- Someone could tell you, hey use 1 inch and that would give you 7.75" (just dividing the distance by 100), close enough! Well it would be for a spotter but it is not always the truth. Let me explain:
Let's say you have a rifle-scope calibrated in MOA (The Turret), and you make some drop tables that give you the answer in inches (IPHY); and let's say that for a 1000 yards shot the table says you need 39 IPHY which are inches. Now you believe that 1 moa is = to 1 inch and you just use your scope and dial 39 MOA on the turret. The most awesome buck was on your sights and you felt confident but the animal just walks away and you loose a once in a life time opportunity. What Happened???? Well this is what happened:

You turned the moa turret to 39 which were really 39 MOA and not inches. That means that... (39"/1.047 = 37.25 moa) --- So instead of inputting 37.25 moa on the turret, we dialed in 39 moa. That's 1.75 moas more than needed... CLOSE ENOUGH! ---- NO! IT'S NOT!!! 1.75 MOA at 1000 yards is:
(1.75 X 1.047) x 10 = 18.3 inches. Your bullet went about 9" over his back!

IN OTHER WORDS:

The drop chart in inches told you to dial 39 IPHY (inches per 100 yards) which is 37.25 moa;
you dialed 1.75 moa more than needed and that equated to 18.3 inches over
the aiming point missing your trophy.
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Old 03-26-2010, 10:39 AM
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Re: MOA?

Get a ramp just so can keep your reticle closer to the middle of your adjustment.[/QUOTE]

What angle ramp would I need? I am planning on getting Kenton Industries to make me new turrets calibrated to my drop chart in yards to coordinate with my laser range finder.

joseph

PS: Thanks to everyone for explaining about MOA.
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