Ooofff, you got a mess of demons happening here...
First let's deal with the bit about powder charges.
Pay close attention, because this one never seems to die and really needs to. Weighing powder is a handloader ONLY invention, because of cheap, accurate scales all across the earth since Plato. No major factory loads weight, they load a VOLUME of powder. Bulk density is a constantly shifting number, so the weight will thus, also vary. Extruded powder has its burning rate controlled by geometry, so you are much better suited to load by volume anyway... Just like the factories who pump it a trillion rounds and want them all to work the same.
Next is cleaning. Unless your groups opened up, why did you do it? If they did, you shouldn't have stopped with the carbon.
What you didn't say is in the time you waited between shots, were the rounds cooking in the chamber? Not good fit consistency if they were.
Also comparing rapid fire to slow isn't the same ball if wax. I did this for another forum a couple months back. Took about a 100 rounds and did a rapid fire in groups of 20. That simulated a match, shows the barrel heat and cooking, ad's to short fatigue, etc.
Take 50 rounds of your stuff and 50 of the factory. Sit at the bench and see which set of 50 is larger.
I say never stop, but I don't load because it's "cheaper". I load because of specific components I want.... And I don't trust anyone else
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