How do you measure your groups ??

[ArtinNC]

Measuring a group in a target . What is the right way ? I measure a single hole in the target . Shooting a 6mm ( .243) and the hole masured .226 in the target . Then I measure the group say .274 and subtract .226 that gives me .048 group . Do you use the size hole in the paper or the size of the bullet ?
If the group is .274 and I take 243 from it then my group would be .031 not .048 . But that is not the way I do it .

 

[Just Say Moe]

Edge to edge 2 farthest holes minus bullet diameter.

 

[Bill Norris]

Edge to edge 2 farthest hole minus bullet diameter.

This is what I do.

 

[Dave Way]

Using the actual hole size will be more accurate. You are actually measuring center to center so subtracting in this case actual bullet diameter will make you feel better because the group seems smaller but it’s incorrect. If you are using digital calipers, measure a single bullet hole, then zero the caliper. Now when you measure outside to outside, you don’t even have to subtract.

Ballistic-X is an inexpensive app that does a great job. You use your phone to take a photo and then calculate the group size.



Dave.

 

[TSFineGuns]

Edge to edge 2 farthest holes minus bullet diameter.

This

 

[jackieschmidt]

An official scoring reticle compensates for the bullet diameter if used correctly.

So I do take into account the actual diameter of the bullet hole in the paper if using dial calipers to go from edge to edge.

But I rarely measure groups. I know when a Rifle is shooting at a competitive level and when it is not.

For instance, these are the last two 5-shot groups at 200 yards Sunday morning I shot with the rifle I am taking to the TackDriver.

I don’t need to measure these to know the Rifle is shooting quite well.

 

[K22]

This is what I do.

Me too.

 

[buckeye68]

Ballistic-X is very easy to use and it measures very thing for you.

 

[jghoghunter]

Yard stick

 

[Silo1616]

An official scoring reticle compensates for the bullet diameter if used correctly.

So I do take into account the actual diameter of the bullet hole in the paper if using dial calipers to go from edge to edge.

But I rarely measure groups. I know when a Rifle is shooting at a competitive level and when it is not.

For instance, these are the last two 5-shot groups at 200 yards Sunday morning I shot with the rifle I am taking to the TackDriver.

I don’t need to measure these to know the Rifle is shooting quite well.View attachment 1488814

You trying to re-create the Bruno's 68gr dual radius(ogive) bullets from days gone past that shot so well?

 

[Straightshooter1]

Measuring a group in a target . What is the right way ? I measure a single hole in the target . Shooting a 6mm ( .243) and the hole masured .226 in the target . Then I measure the group say .274 and subtract .226 that gives me .048 group . Do you use the size hole in the paper or the size of the bullet ?
If the group is .274 and I take 243 from it then my group would be .031 not .048 . But that is not the way I do it .

I assume your measurements are not of competition where .00001 can make a difference. This is just for personal use as you work on getting groups as small as you can. Along this line then, you can use your caliper by zeroing it at the diameter of the bullet, then measure your groups from outside edge of the bullet holes. This way, you don't have to tinker with trying to measure from center to center.

Using a picture of your groups and having an app like Dave Way has shown will calculate more than just group size, like the mean average for the center of the group that tells you more that just a group's ES.

 

[Kevin1990]

I use the ballistic x app And I love it. I think it was $14.99. Keeps me honest.

 

[Propbndr]

As I don’t shoot for score, I use coins to determine group size.

 

[rjtfroggy]

Edge to edge 2 farthest holes minus bullet diameter.

Edge of hole or edge of smudge. Makes a big difference.

 

[expiper]

An official scoring reticle compensates for the bullet diameter if used correctly.

So I do take into account the actual diameter of the bullet hole in the paper if using dial calipers to go from edge to edge.

But I rarely measure groups. I know when a Rifle is shooting at a competitive level and when it is not.

For instance, these are the last two 5-shot groups at 200 yards Sunday morning I shot with the rifle I am taking to the TackDriver.

I don’t need to measure these to know the Rifle is shooting quite well.View attachment 1488814

yowler!!! you certainly have the vertical out of it !!!!!--yep that rifle and shooter is ready for action--gona guess those are around .150"s --at 200yds those are screamers--Roger

 

[thebeav]

I shoot mainly rimfire.
I measure the group from smudge edge to smudge edge and subtract the measurement of a single smudge shot. For .22 caliber, a stand alone smudge size averages .206. I feel that if I would subtract .220 or .224 as I often see, I would be fooling myself into thinking my groups were .014 smaller than they are.

 

[alf]

Most of the groups I measure are from hunting, plinking, & playing guns, so I generally don't have to measure out to out & subtract bullet diameter. I just measure out of one hole to in on the furthermost away hole, & call it good. On the long shots, I may use a tape measure......

 

[fx77]

Electronic caliper
Zero it on the diameter of the bullet you use
measure edge to edge
That is group size

 

[NH30]

I use a ruler that measures in 0.1's. It's easy to put, say, the 2" mark at the center of one 6mm hole, and accurately judge the measurement at the widest hole. I grew up using a slide rule, and am skilled at accurately reading "between the lines". N

 

[ArtinNC]

I measured the hole in the target and come up with this . But a couple people said I should have used .243 . So I was wanting to know how most people measure . Is why I posted this . And thanks for all the replies .