Thread: 3 shot groups are useless!

Ten shots with 77tmks, first three shots were 10mm, then it doubled in size. Interesting thing to me is that their isn't a three shot combination withing the ten that is more than a scope click away from center. So I'm not going to be more than an inch of error at max range of 400 yards.
What throws me in the whole ten shot exercise is how often the first three shots are decent...and then the group grows. Measuring accuracy properly is probably beyond me with anything but the 223.