Here's a plot of 250 shots fired from a rifle at a 200 yard target.
The numbers 0.5, 1 and 1.5 represent radius from group center in inches; 1/2 inch per circle. Extreme spread's about 2.45 inches.
Reverse shoot this composite group by doing the following:
1. Print this picture on a sheet of paper so the target's about true to scale.
2. For the first 5 shot group, lay the printed target sheet centered on a blank sheet of paper of the same size. Then punch a pin through any five shot circles of your choice. Label that sheet group 1.
3. For the second 5 shot group, repeat the above using five other shot circles without pin holes in them. Label that sheet group 2.
4. For the next fourty-eight 5-shot groups do the same thing labeling each one group 3 through 50. And, if you must "shoot" one really tiny group, pick any group of five circles clustered very, very close together (anywhere) for one of them labling it with another word spelled "s m a l l e s t." There's a good, tiny 5-shot cluster to use at 11 o'clock out about 0.35 inch out from center; another's at 7 o'clock out about 0.4 inch.
5. Pick any two 5-shot sheets, measure the distance between the two widest shot circles then write on that sheet.
6. Lay each 5-shot sheet on another sheet then pin punch each one so all 10 punch marks are on that sheet. That's a 10-shot group composite. Measure its extreme spread and label it as group 1 and 2 ten shot composite
7. Repeat steps 3, 4, 5 and 6 with the next four, then six, then twelve, and finally the last twenty-six 5-shot sheets labeling them accordingly.
Now look at all those 5-shot groups and many shot composites. Each 5-shot group represents what 2% of all the fired groups is. The last twenty-six 5-shot group composite of 130 shots represents what the accuracy is about 90% of the time.
How many shots per group does it take for the group to best represent the accuracy of the rifle, ammo and shooter for you?
The numbers 0.5, 1 and 1.5 represent radius from group center in inches; 1/2 inch per circle. Extreme spread's about 2.45 inches.
Reverse shoot this composite group by doing the following:
1. Print this picture on a sheet of paper so the target's about true to scale.
2. For the first 5 shot group, lay the printed target sheet centered on a blank sheet of paper of the same size. Then punch a pin through any five shot circles of your choice. Label that sheet group 1.
3. For the second 5 shot group, repeat the above using five other shot circles without pin holes in them. Label that sheet group 2.
4. For the next fourty-eight 5-shot groups do the same thing labeling each one group 3 through 50. And, if you must "shoot" one really tiny group, pick any group of five circles clustered very, very close together (anywhere) for one of them labling it with another word spelled "s m a l l e s t." There's a good, tiny 5-shot cluster to use at 11 o'clock out about 0.35 inch out from center; another's at 7 o'clock out about 0.4 inch.
5. Pick any two 5-shot sheets, measure the distance between the two widest shot circles then write on that sheet.
6. Lay each 5-shot sheet on another sheet then pin punch each one so all 10 punch marks are on that sheet. That's a 10-shot group composite. Measure its extreme spread and label it as group 1 and 2 ten shot composite
7. Repeat steps 3, 4, 5 and 6 with the next four, then six, then twelve, and finally the last twenty-six 5-shot sheets labeling them accordingly.
Now look at all those 5-shot groups and many shot composites. Each 5-shot group represents what 2% of all the fired groups is. The last twenty-six 5-shot group composite of 130 shots represents what the accuracy is about 90% of the time.
How many shots per group does it take for the group to best represent the accuracy of the rifle, ammo and shooter for you?
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my head hurts 
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