Others may disagree with this but for light barreled hunting rifles, I will keep almost all of my load development to to 2 shot groups, seems that a skinny barrel will show that it doesn't like a load within 2 shots so there's no need of sending the 3rd down the barrel or even having it loaded, just more wear and tear on brass and barrels and if you pull the round it leaves you questioning the resized brass and no one wants to shoot a pulled bullet for anything other than a fouler.
This may be standard information that you already know, not trying to insult your inteligence. When starting I'll find a window of powder I want to shoot, for example in a 6.5x47 with a 130g TMK I'll have 3 charges of Varget, 37.0, 37.3, 37.6 then I'll have 5 different seating depths, .005 into the lands, touching (faint marks on a polished test bullet, toss the Hornady thing in the trash), .005 off, .010 off, .020 off. So I load 2 rounds of each combination, giving me 30 rounds in all, I also use a sharpie to write the load on the brass (both rounds). I set up the target in a grid with 5 targets in a row and at least 3 rows (Sinclair practice benchrest targets work great for this) then mark the individual targets with what the load is, so for example the top row here would be, marked large enough to read through a 20x scope or my spotting scope;
37.0 +5 37.0 T 37.0 -5 37.0 -10 37.0 -20
Then I fore a couple foulers, wait for the barrel to cool, fire the first 2, wait for the barrel to cool, fire the next 2, wash, rinse, repeat.
The reason I mark the cases and the target is in case I get confused on what load is supposed to go where, all I have to do is look, second I can then take that target down, study it and hopefully see a pattern where a tolerable load may be.
I'll then try to back up any load I may like with another 2 shot group, if a load looks good there then I'll try a 3 shot group with it, I do this over different days with hopefully different conditions and temp, cleaning in between and foulers beforehand. If that 3 shot group does well with the first 2 but then the 3rd sneaks out a little, I'm not too concerned, I'd consider it pretty close to being done, I'd then load up maybe 6-8, go shoot a couple 2 shot groups at 200 maybe 400, try and shoot some targets at 600 (we have clay pigeons on a berm we use for this). If it performs well then, I consider it done. Will it shot a knothole with a 3 or 5 shot group? I don't know and I don't care, I have rifles that are made to do that and can, the hunting rifle is not made for doing that, it's made to carry and versatility, for hunting. If it can shoot a good 2 shot group with a cool dirty bore then that is exactly what you want from it in the field, to put the first bullet precisely where you want it and the same with the second. Any more than that, with the rare exception of maybe a coyote, and well, that accuracy didn't really matter in the beginning. You may as well join the 30-30 levergun or "tactical hunter" AR-47 crowd and send 20 rounds down through the woods after a critter.