1 MOA Question

[Spartan-117]

The attached picture shows a circle with a diameter of 1.047 inches and 3 red dots, 3 green dots, and 3 dark blue dots. At 100 yards does the entire bullet hole have to be within the circle like the red dots or are the dark blue dots within 1 MOA? What about the green dots? Is it like scoring a target where as long as the bullet hole touches the bullseye, it is a bullseye? Or is it the opposite and the bullet must be 100% within the 1.047-inch diameter circle?

 

[dgeesaman]

Most of us speak in terms of center to center when it’s moa. And most don’t pay attention to the .047”

Other situations (rimfire 50y) may be outside to outside.

As for the scoring there is not a consistent practice across disciplines. Each ruling body has a target and rules for how it’s scored. Some are best edge some are worst edge, etc.

The less obvious element is group quantity - Benchrest group competition is five shot groups, but many competitors prefer ten shot groups for proving their platforms.

 

[Rocketvapor]

I've always taken 1MOA measured as center to center of the largest circle than captures the holes.
On competition targets it's touching the line.

 

[Rocketvapor]

I measure with Nickles, dimes and quarters.

 

[BoydAllen]

For measuring a group for a match, the first step is to pick the two shots that are the farthest apart. Group size is the center to center distance between those two shots. To be the most accurate, bullet holes are measured outside to outside at the edges of the black ring around the holes that are typical on a white or light background target, and then the diameter of a single bullet hole (measured the same way) is subtracted to get the center to center distance.

 

[jds holler]

On any five shot group, I've found that if I disregard the worst two "outliers" and measure only the three tightest shots, that I feel much better about the groups I'm getting and talking about it with the guys I meet at the sporting goods store. jd

 

[Will Henry]

If you want any input at all from color-blind guys, you can't incorporate red and green dots. I see dark colored dots and other dots. WH

 

[Ned Ludd]

For determining group spread: center-to-center of the two holes farthest apart in the group. Other shooting disciplines/competitions use what are referred to as best edge or worst edge scoring. Best edge scoring means the bullet hole scores the highest score that any part of it touches. The entire bullet hole must be outside the line to receive the lower score. Worst edge scoring is the opposite; the bullet hole receives the lowest score that any part of it touches.

I assume the picture is drawn such that the blue dots just barely touch the line from the outside but do not cross it, the green dots are perfectly centered on the line, and the red dots just barely touch the line from the inside, but do not cross it.

1) In this scenario, the group spread of all shots would be very close to exactly 1 MOA
2) In best edge scoring, all shots would be bullseyes/Xs (or whatever the shot value is inside the ring)
3) In worst edge scoring, the blue and green dots would receive the lower (outside of the ring) score, only the red dots would be bullseyes/Xs

 

[MislMan]

Minute of Angle (MOA) is an angular measurement (1/60th of a degree, 1.047 inches at 100 yards). MOA as such is not a metric for measuring scoring. You could have an MOA shooting firearm and not have a group within any of the scoring rings on the target. Or maybe the group is hitting out between the 7&8 rings. At 100 yards the group may be within the 1.047” of MOA but the has nothing to do with scoring.

 

[cmysix]

I shoot one shot groups and my MOA is consistently very small.

 

[Jeff Porter]

I will typically find the extreme spread of holes and use out side to outside then subtract the bullet diameter to get a center to center value.

 

[M-61]

Once I had this Ballistics X I was happy to have a steady measurement system.

 

[1911nut]

I measure with Cherrios

 

[JEFFPPC]

Most of us speak in terms of center to center when it’s moa. And most don’t pay attention to the .047”

Other situations (rimfire 50y) may be outside to outside.

As for the scoring there is not a consistent practice across disciplines. Each ruling body has a target and rules for how it’s scored. Some are best edge some are worst edge, etc.

The less obvious element is group quantity - Benchrest group competition is five shot groups, but many competitors prefer ten shot groups for proving their platforms.

I measure with Cherrios

View attachment 1519732

I like that. I hear a bold of Honey Nut every morning, I suppose they will do.

 

[Texas Solo]

I measure with Cherrios

View attachment 1519732

That's a donut, not a Cherio.
Nice try.

 

[Coyotefurharvester]

My accuracy improved greatly after I started using the "weatherman" formula. 1/3 the time I just aimed wrong.

 

[1911nut]

That's a donut, not a Cherio.
Nice try.

When the groups get real small I use Hershey’s mini-morsels

 

[jelenko]

That's a donut, not a Cherio.
Nice try.

If so, that's some round. Must be close to 20mm.

 

[Bill Norris]

For measuring a group for a match, the first step is to pick the two shots that are the farthest apart. Group size is the center to center distance between those two shots. To be the most accurate, bullet holes are measured outside to outside at the edges of the black ring around the holes that are typical on a white or light background target, and then the diameter of a single bullet hole (measured the same way) is subtracted to get the center to center distance.

This is how I was taught to measure groups way back the mid 90's. I still do.

 

[Florida Wally]

I thought we were supposed to take the two closest shots, measure from closest edge to closest edge, subtract one bullet diameter and add “all day long if I do my part!”

Edit: I forgot to add the part where we cover the flyer with a dime before we take the Facebook picture.