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It is literally the basis of his load development process. From his website, copied and paste below:

Load Tuning:

Powder charge/Primer testing:

1. Select 2-3 primers to test

2. Select...

Depends what you’re objective is. For a hunting set-up, it’s probably not necessary to continue with the chronograph during seating depth test. But it is worth knowing that your velocity may change...

Every Labradar users experiences seem to vary considerably. Unfortunately, my experiences is that it has to be precisely aligned with the direction of the shot (or across the path of the shot) in...

Essentially because 24gr is not a powder weight that gives a stable velocity node. Statistically, You could shoot it again tomorrow and get the original low SD’s, or it could be twice as bad. Doing...

Respectfully, you haven’t followed Cortina’s method, so you shouldnt be surprised that you’re getting different results.

Starting again, load from 22.0 to 24.0gr in 0.2gr increments. Only 1 round...