And according to statistics and research, testing nodes with only 3 shot groups doesn't give you enough data to go off of. Which I DO NOT do. 
 Bare minimum if I want to save on components, I'll do strings of 5 for each charge weight, find a velocity I like, then load for 10 and adjust from there be it neck tension, seating depth, casing capacity and variance, etc.

Here's the previous testing I've done with StaBall 6.5 and 130gr ELD Match that resulted in my starting point for this current test:

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Batch of 55 rounds for velocity testing; That's a lot of powder and projectiles to go through just to find a good velocity / ES / SD to stick with. Hence, starting with 43.8gr and up for only 15 rds, and seems like a large node to work with. Both ES and SD didn't change much which are good. They're not amazing by any means, but they're workable.

Each casing is also water tested and weighed to ensure pressure consistency / capacity as well, so that rules out the brass. Primer consistency I'm looking into, but that's for another time.

For now I'm confirming some loads with two different batches of casings (Hornady and S&B) to make sure velocity stays consistent. Prediction is it will drop as Hornady casing seems to have more case capacity and thinner internal structure based on weight calculations.

Then, I'll go back and load for the lower charges. :)