Tndeer Logo

Page all of 3 123>
Topic Options
#3360644 - 09/15/13 09:05 PM How Do You Measure MOA?
1shot1kill
4 Point


Registered: 09/06/01
Posts: 404
Loc: unicoi county tn us

Offline
I measure outside edge to outside edge of farthest shot in group with digital calipers then subtract bullet diameter to give me the MOA. Is this how you all do it? Or do you measure one single hole to get your diameter subtraction? Also heard some measure center to center. Just wondering what the standard is. Mr Big and Deer Assasin please chime in.

Thanks

Top
#3360688 - 09/15/13 09:27 PM Re: How Do You Measure MOA? [Re: 1shot1kill]
ratsnakeboogy
10 Point


Registered: 08/28/08
Posts: 3503
Loc: Andersonville, TN

Offline
Center to center minus bullet diameter. That's the way I've always done it.
Top
#3360693 - 09/15/13 09:29 PM Re: How Do You Measure MOA? [Re: 1shot1kill]
Rubberduck270
10 Point


Registered: 11/01/10
Posts: 2886
Loc: Lawrence Co.

content Online
Measure center to center unless its a really clean hole. That's measuring your group size. MOA is minute of angle which is just a fancy way of saying 1.047" per 100 yards.
_________________________
Smokeless Muzzleloading: It ain't your Grampa's flintlock

Top
#3360699 - 09/15/13 09:31 PM Re: How Do You Measure MOA? [Re: Rubberduck270]
Rubberduck270
10 Point


Registered: 11/01/10
Posts: 2886
Loc: Lawrence Co.

content Online
You only subtract bullet dia. if you measure outside to outside. Subtracting the dia. then just gives you the center to center measurement.
_________________________
Smokeless Muzzleloading: It ain't your Grampa's flintlock

Top
#3360743 - 09/15/13 09:54 PM Re: How Do You Measure MOA? [Re: Rubberduck270]
ratsnakeboogy
10 Point


Registered: 08/28/08
Posts: 3503
Loc: Andersonville, TN

Offline
Good to know, thanks.
Top
#3361103 - 09/16/13 09:48 AM Re: How Do You Measure MOA? [Re: ratsnakeboogy]
Deer Assassin
Non-Typical


Registered: 08/01/03
Posts: 87608
Loc: Kingston Springs

Offline
for measuring groups

outside edge to outside edge of the 2 farthest shots - bullet diameter
_________________________
Drag Racing

Spending money I dont have

on things I dont need

to impress people I dont know

Top
#3361198 - 09/16/13 11:13 AM Re: How Do You Measure MOA? [Re: Deer Assassin]
megalomaniac
12 Point


Registered: 10/28/05
Posts: 5096
Loc: Mississippi

Offline
so I don't have to subtract bullet diameter (I didn't do as well with that in school \:\) ), I measure from farside edge of one hole to the nearside edge of the furthest hole for group spread
Top
#3361232 - 09/16/13 11:50 AM Re: How Do You Measure MOA? [Re: megalomaniac]
infoman jr.
10 Point


Registered: 10/05/03
Posts: 4194
Loc: Elizabethtown, KY

Offline
 Originally Posted By: megalomaniac
so I don't have to subtract bullet diameter (I didn't do as well with that in school \:\) ), I measure from farside edge of one hole to the nearside edge of the furthest hole for group spread

That will only work if you have 2 complete bullet holes available. It wouldn't work here:
_________________________
NRA Lifetime Member

Top
#3361632 - 09/16/13 04:49 PM Re: How Do You Measure MOA? [Re: infoman jr.]
DaveB
10 Point


Registered: 09/03/08
Posts: 4320
Loc: Shelby County

Offline
That is good shooting Infoman.
Top
#3361650 - 09/16/13 05:15 PM Re: How Do You Measure MOA? [Re: DaveB]
ratsnakeboogy
10 Point


Registered: 08/28/08
Posts: 3503
Loc: Andersonville, TN

Offline
 Originally Posted By: DaveB
That is good shooting Infoman.


Don't give him the big head, that group was shot with the rifle safely locked down in a robotic lead sled, computer actuated trigger, 11 feet from the muzzle.


JK

Top
#3361706 - 09/16/13 06:29 PM Re: How Do You Measure MOA? [Re: ratsnakeboogy]
1shot1kill
4 Point


Registered: 09/06/01
Posts: 404
Loc: unicoi county tn us

Offline
Thanks for the replies.
Top
#3362016 - 09/16/13 09:36 PM Re: How Do You Measure MOA? [Re: ratsnakeboogy]
infoman jr.
10 Point


Registered: 10/05/03
Posts: 4194
Loc: Elizabethtown, KY

Offline
 Originally Posted By: ratsnakeboogy
 Originally Posted By: DaveB
That is good shooting Infoman.


Don't give him the big head, that group was shot with the rifle safely locked down in a robotic lead sled, computer actuated trigger, 11 feet from the muzzle.


JK


It's totally the rifle's fault. I just tried to stay out of the way!
_________________________
NRA Lifetime Member

Top
#3370608 - 09/23/13 06:51 AM Re: How Do You Measure MOA? [Re: infoman jr.]
Headhunter
10 Point


Registered: 11/14/00
Posts: 4003
Loc: LaVergne, TN USA

Offline
nice shooting infoman.

savage 20 ga, first 3 shot group at 100 yards.

_________________________
Patron Lifetime NRA member

Top
#3373735 - 09/25/13 10:29 AM Re: How Do You Measure MOA? [Re: Headhunter]
Hunter 257W
10 Point


Registered: 10/04/12
Posts: 3335
Loc: Franklin County

content Online
Center to center is the most direct way. I used to doubt how closely a person could measure the center of a ragged hole in paper until I tried measuring a number of groups repeatedly over time and writing down the results without knowing what my previous measurement was. I was amazed how repeatable the measurements were. You can easily repeat out to 2 decimal places(.01).

Of course outside to outside minus bore diamter will get you the same results.

Top
#3385791 - 10/03/13 07:48 AM Re: How Do You Measure MOA? [Re: Rubberduck270]
MUP
Non-Typical


Registered: 08/01/07
Posts: 45514
Loc: Just North of Chatt-town

Offline
So my daughter shot two shots with her .243 yesterday at 100 yds. The ctc measurement was .375(scaled measurement, no calipers). Was this shooting 1/2 MOA then?
_________________________
MUP

Amateurs: Built the Ark

Professionals: Built the Titanic

Top
#3385991 - 10/03/13 09:40 AM Re: How Do You Measure MOA? [Re: MUP]
infoman jr.
10 Point


Registered: 10/05/03
Posts: 4194
Loc: Elizabethtown, KY

Offline
Ehhh kinda. Most people will talk about at least 5 shot groups when assessing a rifle's capability. You have to get enough shots to establish some kind of statistical significance.
_________________________
NRA Lifetime Member

Top
#3386068 - 10/03/13 10:27 AM Re: How Do You Measure MOA? [Re: infoman jr.]
Rubberduck270
10 Point


Registered: 11/01/10
Posts: 2886
Loc: Lawrence Co.

content Online
With a hunting rifle, given it's generally lighter contour barrel, 3 consecutive shots is about max before barrel heat starts affecting performance. In a heavy barreled rifle, 5 shots (sometimes 5+) can be taken before the barrel absorbs enough heat to see changes. It's kind of a trade off though since the lighter contour barrel heats up faster it will also cool down faster.

But like infoman jr. said, anything under 3 shots doesn't really count. Had it been 3 shots at .375" center to center I'd say you have a keeper.
_________________________
Smokeless Muzzleloading: It ain't your Grampa's flintlock

Top
#3386076 - 10/03/13 10:32 AM Re: How Do You Measure MOA? [Re: Rubberduck270]
MUP
Non-Typical


Registered: 08/01/07
Posts: 45514
Loc: Just North of Chatt-town

Offline
Well, actually I was referencing the .375" measurement, and normally would have shot 5 times myself, but had this been a 3-5 shot group, the .375" measurement would qualify as 1/2 MOA tho, correct?...as in the group would measure a sub 1.047/2 group. Is this how MOA is calculated?
_________________________
MUP

Amateurs: Built the Ark

Professionals: Built the Titanic

Top
#3386089 - 10/03/13 10:42 AM Re: How Do You Measure MOA? [Re: MUP]
Rubberduck270
10 Point


Registered: 11/01/10
Posts: 2886
Loc: Lawrence Co.

content Online
Yes. She's 1/2 MOA on 2 shots.
_________________________
Smokeless Muzzleloading: It ain't your Grampa's flintlock

Top
#3386103 - 10/03/13 10:52 AM Re: How Do You Measure MOA? [Re: Rubberduck270]
MUP
Non-Typical


Registered: 08/01/07
Posts: 45514
Loc: Just North of Chatt-town

Offline
Thanks!
_________________________
MUP

Amateurs: Built the Ark

Professionals: Built the Titanic

Top
#3395263 - 10/09/13 02:03 PM Re: How Do You Measure MOA? [Re: MUP]
Hunter 257W
10 Point


Registered: 10/04/12
Posts: 3335
Loc: Franklin County

content Online
 Originally Posted By: MUP
So my daughter shot two shots with her .243 yesterday at 100 yds. The ctc measurement was .375(scaled measurement, no calipers). Was this shooting 1/2 MOA then?


If the distance between the extreme shots is .375 inches @ 100 yards then that is not 1/2 moa. It's .375 (3/8) moa. You are measuring center-to-center. To base the accuracy on outside-to-outside would mean that a large bore gun would have to shoot tighter groups to measure the same as a smaller bore.


Top
#3396059 - 10/10/13 05:59 AM Re: How Do You Measure MOA? [Re: Hunter 257W]
MUP
Non-Typical


Registered: 08/01/07
Posts: 45514
Loc: Just North of Chatt-town

Offline
I meant to type "sub" 1/2 MOA. ;\)
_________________________
MUP

Amateurs: Built the Ark

Professionals: Built the Titanic

Top
#3396274 - 10/10/13 08:59 AM Re: How Do You Measure MOA? [Re: MUP]
mr.big
Non-Typical


Registered: 01/03/01
Posts: 28831
Loc: Copper Head Road

Offline
shooting a target for a challenge on RFC and did the math on the target,,they require 4 single shots in the target to average and have actual bullet hole size instead of subtracting .223,,that number was .207,,then shoot 4 5 shot groups at 25 yards and measure outside to outside and subtract .207,,all 4 5 shot groups have to be under .250 to say your rifle will shoot 1/4 inch groups at 25 yards,,
the Model 4 will almost cut that in half,

_________________________
gun junky

Top
#3397030 - 10/10/13 07:14 PM Re: How Do You Measure MOA? [Re: mr.big]
wcsd462
4 Point


Registered: 11/17/06
Posts: 336
Loc: Wilson Co.

Offline
I've been a lawenforcement sniper/ instructor for 12 years what I tell people as a quick reference, 100 yards is one MOA. One inch.
A moa at 200 yards is 2 in. So on and so fourth.
So if you shoot a group less that one inch at 100 yards you just shot a sub moa group. If you shoot less than a two inch group at 200 yards, you just shot a sub moa group at 200 yards. So on and so fourth. My experience is that people and instructors make MOA more difficult than it needs to be. What really will blow your mind is when you get out past 2000 yard.
_________________________
Poplar Hill Kennel's
Home of :
SqCh Curtis' 6-Gun Boggs Creek Shooter
NtCh GrSqCh Poplar Hill Hunter

Top
#3397516 - 10/11/13 05:04 AM Re: How Do You Measure MOA? [Re: wcsd462]
MUP
Non-Typical


Registered: 08/01/07
Posts: 45514
Loc: Just North of Chatt-town

Offline
Thanks for explaining it that way wcsd462. ;\)
_________________________
MUP

Amateurs: Built the Ark

Professionals: Built the Titanic

Top
#3397766 - 10/11/13 08:39 AM Re: How Do You Measure MOA? [Re: MUP]
mr.big
Non-Typical


Registered: 01/03/01
Posts: 28831
Loc: Copper Head Road

Offline
I thought he just wanted to know how to measure a group,,if he wants a full lesson on what moa is and how it relates to long range shooting we can start a new thread,,and then as long as your reticle and your adjustments match it is pretty simple,,I actually prefere moa adjustments with moa reticles in ffp as the mil/mil scopes,,but would rather have mil/mil as a scope with moa adjustments and mil-dot reticle,
_________________________
gun junky

Top
#3397797 - 10/11/13 08:52 AM Re: How Do You Measure MOA? [Re: mr.big]
MUP
Non-Typical


Registered: 08/01/07
Posts: 45514
Loc: Just North of Chatt-town

Offline
Yep, just wanted to know about MOA measurement, to start with, but all this info is great. ;\)
_________________________
MUP

Amateurs: Built the Ark

Professionals: Built the Titanic

Top
#3400596 - 10/13/13 04:20 PM Re: How Do You Measure MOA? [Re: wcsd462]
redblood
16 Point


Registered: 01/22/06
Posts: 15008
Loc: Lewisburg

Offline
 Originally Posted By: wcsd462
I've been a lawenforcement sniper/ instructor for 12 years what I tell people as a quick reference, 100 yards is one MOA. One inch.
A moa at 200 yards is 2 in. So on and so fourth.
So if you shoot a group less that one inch at 100 yards you just shot a sub moa group. If you shoot less than a two inch group at 200 yards, you just shot a sub moa group at 200 yards. So on and so fourth. My experience is that people and instructors make MOA more difficult than it needs to be. What really will blow your mind is when you get out past 2000 yard.



for quick reference that will work, although 2" at 200 yards is not quite a minute of an angle, nor is 3" at 300 or 4" at 400 yards
_________________________
"I will predator hunt for food "

Top
#3401024 - 10/13/13 08:59 PM Re: How Do You Measure MOA? [Re: redblood]
wcsd462
4 Point


Registered: 11/17/06
Posts: 336
Loc: Wilson Co.

Offline
 Originally Posted By: redblood
 Originally Posted By: wcsd462
I've been a lawenforcement sniper/ instructor for 12 years what I tell people as a quick reference, 100 yards is one MOA. One inch.
A moa at 200 yards is 2 in. So on and so fourth.
So if you shoot a group less that one inch at 100 yards you just shot a sub moa group. If you shoot less than a two inch group at 200 yards, you just shot a sub moa group at 200 yards. So on and so fourth. My experience is that people and instructors make MOA more difficult than it needs to be. What really will blow your mind is when you get out past 2000 yard.



for quick reference that will work, although 2" at 200 yards is not quite a minute of an angle, nor is 3" at 300 or 4" at 400 yards


Yes blood I know, that's why I said as a quick reference. Bench guys may worry about getting out the slide rule, but in my world and the world I was trained this works. Minute of head is really all we worry about. Thanks
_________________________
Poplar Hill Kennel's
Home of :
SqCh Curtis' 6-Gun Boggs Creek Shooter
NtCh GrSqCh Poplar Hill Hunter

Top
Page all of 3 123>


Moderator:  RUGER, gtk, Bobby G, Unicam, CBU93, stretch, TurkeyBurd, Kimber45, Mrs.Unicam, Crappie Luck 
Hop to:
Top Posters
4105883
RUGER
87608
Deer Assassin
65673
BSK
61392
Crappie Luck
51376
spitndrum
Newest Members
TnDear, buckslayer85, crose84, Fisher 1959, AKeys
13384 Registered Users
Who's Online
110 registered (2in1shot, JAY B, Planking, wildb1, BigPete357, TN Whitetail Freak, 11 invisible) and 183 anonymous users online.
Forum Stats
13384 Members
42 Forums
95932 Topics
1123399 Posts

Max Online: 788 @ 11/11/13 08:06 PM
Moon Phase
CURRENT MOON
October
Su M Tu W Th F Sa
1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30 31
Forum Donations
The TnDeer.Com Deer Talk Forum is for Tennessee Deer Hunters by Tennessee Deer Hunters. If you enjoy using our Talk Forum and would like to contribute to help in it's up-keep. Just submit your contribution by clicking on the DONATE button below and paying with PayPal or a major credit card. Any amount is much appreciated. Thanks for your support!

TN Burn Safe

Generated in 0.05 seconds in which 0.001 seconds were spent on a total of 14 queries. Zlib compression enabled.