Doug - perhaps think about what it is that you want to accomplish? Bench rest, etc. is scored about what did your last 5 or 10 or whatever shots do - for some, that is the measure of something. I spent most of my shooting as a hunter - so my primary concern became where is the next shot going to go? So the group size, for me, is about probability - 3 shots give less certainty than 5 shots, which is less certainty that 10, than 20, etc. The mathematics of probability can help you work out how many shots needed to be 95% sure (or 97%, or 99.9%) where the next one will go - is not typically a concern for some target competitions - where what you did counts, not what you will do.
I did not word that last part exactly how I meant - for a hunter, is mostly the "next" shot that counts - for target scores, is all your past shots that get scored - maybe different emphasis??
And, is some discussion that I read where a typical hunter is concerned with the first, clean, cold barrel shot - where does that go? May or may not be related to the groups that you and the rifle shoot - but is the one shot of most concern. I read many target shooting disciplines have "sighting in" shots, have "warm up" and so on, prior to producing groups for score - is a very different thing than the hunter's requirement to place that first one, precisely.
Some time ago I read an Internet article by an alleged US Marine sniper - who claimed to have been coached by Carlos Hathcock - I hope the story was true - I do not know that. Writer said that he was free to fire whatever he wanted during the day - to "practice" - the "test", however, was each morning - rain, sunny, windy, calm, cold or hot - meet Hathcock at a range - a target at unspecified / unknown distance to student - now put a bullet into it - yes or no, hit or miss - one shot for "all the marbles". Hathcock apparently had no interest in any more shots - that was up to the student - Hathcock concerned only about the clean, cold barrel hit or miss - one shot per day.