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Hmmm, I dont believe that five 5 shot groups are necessary to determine if its a good load or not. One group should do it in my book as long as I do my part... shooting five 5 shot groups of each load during load development would be a HUGE waste of bullets, powder, and time.
Think, do you really want a load thats accurate SOME of the time? A good load will be good EVERY time you shoot it. If it is sub MOA 3 out of 5 groups, then its not a good load. It needs to be consistent 5 out of 5 times. Of course, if its sub moa 3 out of 5 times, and much larger the other two, its probably something you are doing in the reloading process thats throwing some off. or you arent waiting for your bbl to cool, etc....
When testing a load, I load 5 rounds. A hunting rifle is really only good for a 3 shot group unless you have LOTS of time between shots anyway. Having 5 rounds of a particular load gives me 2 "oops" shots. I know the second I pull the trigger if the shot was good or if I did something wrong that will cause the shot to go off target. If Its MY fault the shot goes wide, I dont count it in the group.
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