"I would be curious to know how a box of CP's breaks down into what a shooter considers "match" grade for his rifle."
I can answer that!!!
From the whole box there maybe only 20 pellets that I deem junk and so they make it into the scrap pile/tin.
I sort into lots! So I'll do 10.4,10.5,10.6,10.7 since those are the majority of what is in the box yielding a +/- .00002th grain tolerance (Note: that I've found the same tolerance levels of about +/-.0002th gr in say JSBs). The rest that I usally fine and reject are 10.3, 10.8, 11.0 and the few mashed skirts which so far since I've shot CPHs amount to like 1/0th of a tin maybe so far.
After they are sorted into the largest groups I consider all of those shootable match-grade pellets. A click or two at sight in can be used if need be to adjust for poi from one lot to the next if one chooses. But I don't have a plink/practice piles. I comnpete with them all, but I only shoot one weight in a match. So as an end result there is no mixing sizes here at match time. If I started on Friday shooting 10.6 then I shoot that weight Friday, Saturday, and Sunday.
It is what it is, because it is!!!