How to measure my groups?


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dc.fireman
September 29, 2011, 07:36 PM
I have a simple question, when it comes to measuring my group sizes:

When examining a particular group for accuracy, which measurement should I be looking at (I'm using On-Target, to determine my measurements)?

Is it the Max. spread? Or the average CTC (Center to Center)?

http://i82.photobucket.com/albums/j246/dcfireman/SAV12BVSS2.jpg

http://i82.photobucket.com/albums/j246/dcfireman/SAV12BVSS1.jpg

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BigN
September 29, 2011, 07:53 PM
Many people measure their groups in many ways. I take a shot group, measure center to center of the furthest two apart, and that's the outer size of the shot group. Some average, some draw a square and measure that way. If you have three shots, two are 1/2" apart but one is 3/4 inch from the furthest one, 3/4" is your shot group size.

dc.fireman
September 29, 2011, 07:59 PM
Thanks!

esheato
September 29, 2011, 08:06 PM
I measure outside to outside, then subtract the bullet diameter giving me CTC size.

You could always use OnTarget (http://www.ontargetshooting.com/download.html) software too.

Walkalong
September 29, 2011, 08:54 PM
I take a shot group, measure center to center of the furthest two apart, and that's the outer size of the shot group
I measure outside to outside, then subtract the bullet diameter giving me CTC size.
Either way gives you the same thing, and is the correct way to measure group size.

Fatelvis
September 29, 2011, 09:58 PM
I measure outside to outside of my bullet holes and subtract 3X the bullet diameter. I seem to get better groups that way.... ;)

dc.fireman
September 29, 2011, 10:24 PM
I measure outside to outside, then subtract the bullet diameter giving me CTC size.

You could always use OnTarget (http://www.ontargetshooting.com/download.html) software too.

Thanks, thats what I'm using.

jcwit
September 30, 2011, 12:42 AM
I make a 3 shot group, measure the center to center of the 2 closest and thats my group size. Man alive do I ever get some fantastic groups using this method.

Also when fishing I have a special tape measure to measure even the smallest fish.

gamestalker
September 30, 2011, 01:19 AM
I use a yard stick to measure my groups. It faster than having to mark a ruler end to end, and more accurate. There is a big difference between 35.43" groups and 34.98" groups.

ConcernedCitizen
September 30, 2011, 01:34 AM
I don't measure my groups, I just count the number of shots that actually hit the target...

Some days I shoot 3 shot groups, other days I shoot 5 shot groups...;)

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