Long Range Hunting Online Magazine MOA readings
 Home LRH Store Forums Long Range Rifles Articles Reviews Group Hunts Shooting Classes G7 Ballistics Calculator Rules & FAQ Register Search Today's Posts Mark Forums Read

 Long Range Scopes and Other Optics

#1
04-02-2008, 10:47 PM
 Junior Member Join Date: Mar 2008 Posts: 10

All right, dumb question. Say your scope has 56 MOA of adjustment. What does that mean. Is that 56 inches up or down at a 100 yards if so, what about at 600 yards. Now when you turn the turrets to adjust for drop, do you have to figure the MOA at that distance or does it do it automatically when you do the math for the given yardage. Sorry for the elementry question, but I'm trying to figure out if a scope will have enough adjustment for the given distance......Thanks
#2
04-03-2008, 03:29 AM
 Gold Member Join Date: Dec 2002 Location: mathias wv Posts: 987
1 moa is 1.047" per 100 yards of range, so those 4 1/4 MOA clicks will move the bullet 1.047" at 100
2.094" at 200 (1.047"x2=2.094)
3.141" at 300 (1.047x3=3.141") and

9.1089" at 870 yards (1.047"x8.7=9.1089")

MOA= a unit of angular measurement equal to 1/60th of 1 degree which equals 1.0473" per 100 yards.
there are 21,600 MOA in a circle, and 1 moa at the end of your 24" muzzle is .00698", hope this helps
RR
__________________
Born to Hunt, Forced to Work!
#3
04-03-2008, 05:25 AM
 Platinum Member Join Date: Mar 2007 Location: MN Posts: 1,219
+ 1 for ridgerunner.
Most scopes are actually set up in inches per hundred- so you have to figure out which yours is. I know nikon, Busnell, Zeis (I think) and many others are set up in inches per hundred (4 clicks = 1 inch per hundred yards)
__________________
-- Well, at least I try --
#4
04-03-2008, 11:04 PM
 Junior Member Join Date: Mar 2008 Posts: 10
OK, it's obvious that I am new to this MOA thing. If a scope has the 56 MOA adjustments, and my bullet drops say 58" at 600 yards, is there enough adjustment to calculate for bullet drop. Again thanks for the replies.......
#5
04-03-2008, 11:23 PM
 Platinum Member Join Date: Mar 2007 Location: MN Posts: 1,219
Yes. most likely

When we say Inches Per Hundred Yards (IPHY), it is just that: so many inches of elevation for every hundred yards. So for the next few examples we will use the following number that I pulled out of my hat - 15 (IPHY). If you take 15 inches per hundred (what many incorectly call MOA), for every hundred yards you move away - you multiply the moa by that number inorder to atain the actual drop at a certain range. Ie. if you are at 100 yards you take 15 (IPHY) x 1 = 15 inches. if you are at 300 yards you take 15 (IPHY) x 3 = 45 inches. if you are at 800 yards you take 15 (IPHY) times 8 = 120 inches and so on.

I decided to add this to help clairfy the difference; if you take the same case in MOA, it would be 15 moa is (15 x 1.047 x how many hundred yards). Ie. at 100 yards you take 15 x 1.047 x 1 = 15.7". 15 MOA at 300 yards is 15 x 1.047 x 3 = 47.1". 15 MOA at 800 is 15 x 1.047 x 8 = 125.6".

here is where it gets tricky 1 MOA is acutally 1.047 inches per hundred yards. This means vertually nothing at close and mid range. However, when you start to adjust your scope 15-20 units (MOA or IPHY)and are trying to hit a target at several hundred yards away. that .047" per unit per hundred yards starts to add up in a hurry. My 300 wsm with a zero at 200 will miss a 600 yard target by something like a foot ( slight exageration I guess) if I am using calcuations for MOA and adjusting a scope that is set for IPHY.
__________________
-- Well, at least I try --

Last edited by britz; 04-03-2008 at 11:57 PM. Reason: cuz
#6
04-03-2008, 11:24 PM
 Gold Member Join Date: Feb 2008 Location: Sonoma County, CA Posts: 827
I'm pretty new to the MOA concept as well but what is helping me is to just consider MOA as 1" @ 100 yds. I am using this initially just to help me understand the concept. Yes I understand that 1.047 is technically correct, but that will come in time.

When you adjust your scope 1 MOA, that moves your point of impact 1" @ 100 yds. That same 1 MOA adjustment moves your POI 2" @ 200 yds, 6" @ 600 yds, etc. So the way I understand it is moving your scope 56 MOA would be 56" @ 100 yds.

If you needed to adjust for a bullet drop of 2" @ 100 yds, that would be 2 MOA. If you needed to adjust for a bullet drop of 2" @ 200 yds, that would only be a 1 MOA adjustment.

I hope this helps to get you started. Maybe someone like Shawn will chime in and give us all a quick lesson.
#7
04-04-2008, 12:05 AM
 Gold Member Join Date: Oct 2006 Location: Oregon City, OR Posts: 509
Easy but not Precise

I use the 1 inch - 1 MOA @ 100yrd.
How i do it. Run your drop chart like you did 58" come ups for 600yrds. Divide 58 by 6 = 9.66 MOA. I would round it to the nearest .25 moa assuming your scope it 4 clicks per 1 MOA. I would try 9.5 MOA or 9.75.

Just drop the zeros and divied you inches by that number. for 550 yards divide by 5.5

Willys

 Bookmarks

 Thread Tools Display Modes Linear Mode

 Similar Threads for: MOA readings Thread Thread Starter Forum Replies Last Post Kris C Rifles, Bullets, Barrels & Ballistics 3 05-08-2009 08:46 PM buffalorancher Rifles, Bullets, Barrels & Ballistics 5 09-27-2007 12:33 PM Alan Griffith Reloading 11 04-10-2006 10:36 AM Nicholas Rifles, Bullets, Barrels & Ballistics 7 06-20-2003 08:26 AM Dave King Rifles, Bullets, Barrels & Ballistics 7 07-20-2002 06:25 AM

All times are GMT -5. The time now is 10:44 PM.