Survivalist Forum

Advertise Here

Go Back   Survivalist Forum > Firearms and Other Weapons Forum > Firearms General Discussion > Rifle Forum
Articles Chat Room Classifieds Donations Gallery Groups Links Store Survival Files



Advertise Here
Reply
 
Thread Tools Display Modes
Old 08-22-2010, 02:06 PM
paramilusmc's Avatar
paramilusmc paramilusmc is offline
Survivor
 
Join Date: Aug 2010
Location: Back home in the North
Posts: 5,116
Thanks: 1,490
Thanked 4,375 Times in 2,007 Posts
Default Minutes of angle (MOA) and clicks explained



Advertise Here

Ok there is some miss information here on the site and it seems as if there is some confusion on how or what MOA is. So allow me to clear up a few things.

First of all, a click on your scope is different than MOA (minutes of angle). Most scopes are 1/4 MOA adjustment. Others have 1/8 MOA adjustments. It will most always say right on your scope turret what adjustment it is.

For a scope with 1/4 minute adjustments, 1 click is equal to a 1/4 inch change in point of impact at 100yds. 1 MOA at 100yds would be four clicks and would cause a 1 inch change in point of impact at 100yds.

Now to blow your mind, ready? A 1 MOA adjustment will move the point of impact of the round, 10 inches at 1000yds.

Basically:
1MOA at 100yds=1 inch shift,
1MOA at 200yds=2 inch shift
1MOA (still four clicks)at 300yds=3inch shift
and so on and so forth

So if a .22 40gr bullet falls 157 inches at 300yds (information provided in a previous thread), you take 157 inches, divide it by three (300 yds, 3 is the constant) and that equals 52.3 MOA (minutes of angle). Take that 52.3 MOA, round to the nearest .25 so 52.25MOA. (Usually you would round up, but .3 is really close to .25) Now you have your minutes of angle.

How do you translate that into clicks? Well if 1 MOA is 4 clicks on a 1/4 inch adjustment scope (8 clicks on a 1/8 adjustment scope) then simply take that 52.25 MOA and multiply it by four. So to hit your target at 300yds with this information provided, you will have to adjust your scope 209 clicks of elevation. This is if the information above is correct. This will change with bullet weight, barrel length and atmospheric conditions. Each gun also shoots differently so this should get you close enough so you can make any fine adjustments to put you dead center.

I hope I broke this down Barney style for those of you reading.

In comparison a .308, 175gr boat tailed sierra bullet out of a 26inch barrel drops right around 36.75MOA at 1000yds. That's about 147 clicks of elevation.

Hope this helps.
The Following 13 Users Say Thank You to paramilusmc For This Useful Post:
Old 02-17-2011, 01:44 PM
airdrop's Avatar
airdrop airdrop is offline
Hunter
 
Join Date: Feb 2011
Location: Moved to Michigan :( lol
Posts: 1,137
Thanks: 2,512
Thanked 1,065 Times in 622 Posts
Default

It's hard to picture it but the site angle is a wedge an the wedge is going up at a ever incresing height. you have to put the bullet out of your mind until you get this squared away. Then you look at bullet drop an place this in conjunction to this wedge an how you adjust for drop and how the wedge needs to be moved up or down . If a bullet drops 9'' at 300 yds. the wedge is raised by 3 MOA 3 moa times 3(00) yds equals 9 ins in elevation. if drp is 36" at 400 yds , divide 36 by 4 = 9 MOA to raise impact to zero. now 9 MOA times 4 equals 36 1/4 in clicks,,, it just gets better lol. if the sight is moved up 1 MOA the wedge as it is on the raise will be 2" at 200 . 3" at 300, 4" at 400 an so on. graft it on paper
The Following User Says Thank You to airdrop For This Useful Post:
Old 02-17-2011, 10:06 PM
wldrbob's Avatar
wldrbob wldrbob is offline
Hiker
 
Join Date: Dec 2010
Location: northeren manitoba
Posts: 737
Thanks: 170
Thanked 774 Times in 344 Posts
Default

it even gets more fun when you tell then moa is actualy not an inch
The Following User Says Thank You to wldrbob For This Useful Post:
Old 02-18-2011, 12:17 AM
magfed556 magfed556 is offline
I love this forum
 
Join Date: Sep 2008
Location: West of everyone East
Posts: 2,076
Thanks: 1,122
Thanked 2,212 Times in 872 Posts
Default

Quote:
Originally Posted by wldrbob View Post
it even gets more fun when you tell then moa is actualy not an inch
1.0471996 at 100 yards.
Old 02-18-2011, 12:41 AM
kyle1337 kyle1337 is offline
Not To Reason Why...
 
Join Date: Dec 2009
Location: ...
Posts: 1,966
Thanks: 821
Thanked 1,492 Times in 745 Posts
Default

ahh good 'ol kentucky windage...whats all the math for
The Following 3 Users Say Thank You to kyle1337 For This Useful Post:
Old 02-21-2011, 05:51 PM
Hummer Hummer is offline
Trapper
 
Join Date: Feb 2010
Location: We seceded first
Posts: 772
Thanks: 139
Thanked 626 Times in 312 Posts
Default

By all means do not mention the fact that very few scopes repeat and that internal adjustment scopes get funky at the extreme end of their travel as movement is restricted.

How does one know if they have a scope that repeats. You can do it with about two boxes of ammo.

Zero at say 200 yards off the bench for POA/POI ( translation is it hits where you aim it) and establish a 10 round group size.

Put up a new target and shoot a 3 round group and click up 20 clicks, right 20 clicks, down 20 clicks and left 20 clicks and shoot one round.

Next left 20 clicks, down 20 clicks, right 20 clicks and up 20 clicks and shoot another round.

Continuing on click up 20, left 20, down 20 and right 20 and shoot another shot followed by right 20, down 20, left 20 and up 20 and shoot another round.

If the scope repeats correctly the second group won't be any larger than the first group.
Old 02-21-2011, 06:20 PM
ManyFeathers's Avatar
ManyFeathers ManyFeathers is offline
My Dixie Wrecked
 
Join Date: Sep 2010
Location: Republic of Texas
Age: 55
Posts: 6,275
Thanks: 7,820
Thanked 16,713 Times in 4,686 Posts
Default

Quote:
Originally Posted by kyle1337 View Post
ahh good 'ol kentucky windage...whats all the math for
I set mine for MPBR (maximum point blank range), which, for the rifles I shoot, is typically just shy or just over 300 yds!

Then I hold over for anything over 300 yds. You need to know your ballistics and range very well. Then there's windage.....

Uphill/Downhill shots will really blow your mind at 300 yds on a windy day...LOL
The Following User Says Thank You to ManyFeathers For This Useful Post:
Old 05-21-2011, 02:21 AM
paramilusmc's Avatar
paramilusmc paramilusmc is offline
Survivor
 
Join Date: Aug 2010
Location: Back home in the North
Posts: 5,116
Thanks: 1,490
Thanked 4,375 Times in 2,007 Posts
Default

Quote:
Originally Posted by ManyFeathers View Post
Uphill/Downhill shots will really blow your mind at 300 yds on a windy day...LOL
That's not even taking into account that gravity plays a different part in uphill and downhill shooting. When shooting at extreme angles ALWAYS aim low or you will miss the shot.
The Following User Says Thank You to paramilusmc For This Useful Post:
Old 05-21-2011, 09:19 AM
vicdotcom's Avatar
vicdotcom vicdotcom is online now
Maximus
 
Join Date: Jun 2009
Posts: 11,823
Thanks: 6,697
Thanked 13,893 Times in 6,179 Posts
Default

Quote:
Originally Posted by paramilusmc View Post
...So to hit your target at 300yds with this information provided, you will have to adjust your scope 209 clicks of elevation. ....
LOL this made me laugh for some reason. Can you imagine someone loosing count after 183 clicks LOLLOL
Old 05-21-2011, 11:06 PM
paramilusmc's Avatar
paramilusmc paramilusmc is offline
Survivor
 
Join Date: Aug 2010
Location: Back home in the North
Posts: 5,116
Thanks: 1,490
Thanked 4,375 Times in 2,007 Posts
Default

Quote:
Originally Posted by vicdotcom View Post
LOL this made me laugh for some reason. Can you imagine someone loosing count after 183 clicks LOLLOL
Ya sometimes I forget to bring my scope back to zero after a day at the range, I have had to get in the practice of writing in my logbook whether or not I have come back to zero. Or else that first round the next time i go to the range is like, WTF.
The Following User Says Thank You to paramilusmc For This Useful Post:
Old 05-21-2011, 11:28 PM
predestyned predestyned is offline
I love this forum
 
Join Date: Mar 2011
Posts: 488
Thanks: 326
Thanked 435 Times in 206 Posts
Default

bore sighting will save yourself a whole hell-uva -lot of clicking!
Old 05-21-2011, 11:52 PM
paramilusmc's Avatar
paramilusmc paramilusmc is offline
Survivor
 
Join Date: Aug 2010
Location: Back home in the North
Posts: 5,116
Thanks: 1,490
Thanked 4,375 Times in 2,007 Posts
Default

Quote:
Originally Posted by predestyned View Post
bore sighting will save yourself a whole hell-uva -lot of clicking!
But only to get a short range zero, and even then you will only get close. Bore sights cannot account for gravity or range.

A great tool for initial sight inns though.
Old 05-22-2011, 12:09 PM
Doc_Shane's Avatar
Doc_Shane Doc_Shane is offline
Chaos Inc.
 
Join Date: Apr 2011
Location: Earth
Posts: 8,771
Thanks: 6,174
Thanked 23,338 Times in 6,633 Posts
Default

CQB- point shooting and reflex sights, long range shooting is not the forte of my favorite carbine.

MOA does boggle some peoples mind.
Old 05-27-2011, 04:15 AM
paramilusmc's Avatar
paramilusmc paramilusmc is offline
Survivor
 
Join Date: Aug 2010
Location: Back home in the North
Posts: 5,116
Thanks: 1,490
Thanked 4,375 Times in 2,007 Posts
Default

I strongly suggest to anyone that wants to practice the art of range estimation and precision shooting to use the shooter ready program, great learning tool that doesn't require the cost of putting rounds down range to learn. This way you can learn/practice on a computer then effectively put rounds down range when your ready for practical application.

http://www.shooterready.com/lrs.html

Try the sample.
The Following User Says Thank You to paramilusmc For This Useful Post:
Old 05-28-2011, 08:13 AM
vicdotcom's Avatar
vicdotcom vicdotcom is online now
Maximus
 
Join Date: Jun 2009
Posts: 11,823
Thanks: 6,697
Thanked 13,893 Times in 6,179 Posts
Default

Quote:
Originally Posted by paramilusmc View Post
I strongly suggest to anyone that wants to practice the art of range estimation and precision shooting to use the shooter ready program, great learning tool that doesn't require the cost of putting rounds down range to learn. This way you can learn/practice on a computer then effectively put rounds down range when your ready for practical application.

http://www.shooterready.com/lrs.html

Try the sample.
Hey thanks! That was fun!

Scored a 50 on the target shooting sim.
Old 05-28-2011, 08:46 AM
paramilusmc's Avatar
paramilusmc paramilusmc is offline
Survivor
 
Join Date: Aug 2010
Location: Back home in the North
Posts: 5,116
Thanks: 1,490
Thanked 4,375 Times in 2,007 Posts
Default

I have there earlier shooting program and it was good, but this one looks allot more fun and allot more realistic.

it is a blast to practice from home on those real nasty days you just don't want to be out in the weather.
Reply

Bookmarks



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
The World Of Religion - explained in less than four minutes Dark Skies Jokes, Humor & Music 0 08-14-2010 08:27 PM
World Collapse Explained in 3 Minutes wldennis Financial Forum 8 06-02-2010 09:27 PM
Web-Tex brand angle flashlight? combatreadyguy Disaster Preparedness General Discussion 0 04-15-2010 03:40 AM
angle iron silberfuchs Knives, Swords & Axes 12 04-30-2009 10:37 PM
20 degree scope angle? dgutier0922 Firearms General Discussion 7 12-20-2008 10:14 PM


All times are GMT -5. The time now is 10:07 PM.


Powered by vBulletin®
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Kevin Felts 2006 - 2012,
Green theme by http://www.themesbydesign.net