How accurate do you want your zero to be?
In SOTIC, we zero'd with 10 shot groups and generally shot 5 shot groups in training exercises.
Why?
Quote:
3. Conclusions/Continuing Questions
I’ll do this as a bulleted list here for those of us who hate math/reading/attention span:
3-shot groups cannot precisely describe the actual distribution of shots. 10-shot groups can precisely describe the actual distribution of shots.
3-shot groups cannot precisely describe the zero of the rifle nearly as well as 10-shot groups.
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http://www.bealeinnovations.com/stats-3shotgroup.pdf
The reason 3 shot groups are not ideal is based upon physics and science. It is not based upon how you feel about it.
However, you can "pad" the statistics using a 3-shot group. Simply shoot ANOTHER 3 shot group to confirm your zero. So, six bullets at POA/POI using 3 shot groups equals a zero that is very close statistically to a zero based upon ONE 5 shot group POA/POI.
A 10 shot group is ideal.