The very definition of extreme spread is that it is the difference between the two most extreme data points. So it is not misleading. It is defined as such.
Yes, I know what it is called. But extreme in the real world has a far different aspect than match or statisticians.
So, if I shoot 5 bullets and the spread is 10, its still extreme.
The business about two shots defining extreme is the worst part. Duh. I mean really, its what we want to know. What is the spread?
If bullet B is withing 2 FPS of bullet A, that also tells you something.
So statistically we diss the two points because they are not statistically valid (too small a sample). But but the very definition they can never be valid.
And therein I heartily disagree. If our 5 or 10 rounds are 35 FPS of each other, we have done a good job reloading.
Equally the factory 270 that was 200 fps off and was way off on the target also told me something. It was not typical. It was wild. For typical I can throw it out.
Now if that keeps happening, you can throw the ammo away (well pull the bullet and turn it into something useful)
The same with other loads, if I have one round way outside the norm, there is something wrong with THAT round. I can throw it out (delete it) and I can look for what and why it was. Almost certainly an off powder charge.
If I am deep into tiny holes (or competition) I can throw those out and or I can double check the powder charges.
Each field comes up with its own terms. That does not mean you can't challenge them.
VS (Velocity Spread) would be a good one to replace it with.
The Fire Sprinkler system world uses a term for pressure that has not velocity component to it, aka Residual Pressure.
The rest of the tech world uses the term Static Pressure. Maybe it makes Sprinkler engineers feel special to have their own definition. Pewee on them.
And don't even get me started on Surveying that breaks a circle into 90 degree segments and then makes you cross calculate what that means cal wise to get the right number turn the transit to 225 degrees because you cross 3 of those 90 deg segments.
You want to put errors into something, that is the way to do it. Statistically its a really bad idea.