perhaps a dumb question.... How exactly do you measure group size???

[Grendel-Gene]

I admit this may be a dumb question.... but just what is the "official" way of measuring a group size?

Do you measure the distance between the two most separate shots in the group? If so, do you measure center hole to center hole or do you measure from the outside edges of those two most distant holes?

Just want to know how to do it correctly.....

Thanks

[LRRPF52]

Find the furthest from each other, and measure center-to-center, or far-side edge of one to near-side edge of another. Not far-side edge of one to far-side edge of the other.

[YutYut]

I was taught center to center of the 2 furthest shots.

[bwaites]

The most accurate way is to measure far side to far side of the two widest seperation holes, then deduct the diameter of the bullet. Thus....

Far side to far side equals 1.264 inches. Deduct the diameter of the bullet, 1.264-.264, and you have a 1 inch group.

LRRPF52's method is also accurate, but sometimes it is impossible to find the inside edge if two shots overlap.

Center to Center is impossible, because you are simply guessing where the actual center is, AND having to guess twice in the same measurement!

[YutYut]

Well put bwaites. I will use that method from now on. Theres also a computer program that calculates the group for you.
http://www.ontargetshooting.com/

[Texas Sheepdawg]

Well put bwaites. I will use that method from now on. Theres also a computer program that calculates the group for you.
http://www.ontargetshooting.com/

I am playing with the free version of that software. It is okay...

[YutYut]

Me too. I have the android version. Ill upload a picture

[YutYut]

http://i731.photobucket.com/albums/ww320/D-B4-D-USMC/Factory_Hornady_123gr_AMAX_.jpg
it has its flaws but its pretty cool.

[sgt_murf]

The most accurate way is to measure far side to far side of the two widest seperation holes, then deduct the diameter of the bullet. Thus....

Far side to far side equals 1.264 inches. Deduct the diameter of the bullet, 1.264-.264, and you have a 1 inch group.

LRRPF52's method is also accurate, but sometimes it is impossible to find the inside edge if two shots overlap.

Center to Center is impossible, because you are simply guessing where the actual center is, AND having to guess twice in the same measurement!
+1 Use the same method except
On Service Rifle / Competition / Tactical weapons the groups are 20 shots using the furthest distance between the groups gives the best data.
On hunting arms usually 5 shot groups give the best as one usually does not fire more than that hunting (key word is usually)
Cuz when the load is dialed in the wind and elev side are pretty much the same unles the wind is blowing

[Grendel-Gene]

Thanks... I just wanted to be sure so that when I get decent ammo you dont think I am bragging!!! ha ha!!!