Get what you are saying, at a practical level I would think you are via QL eliminating several possible variables in case fill and from there possible variations in powder column surface area for the primer gas jet to work on and ignite. What you are saying seems to me to agree with the stuff I've looked at on the topic where to sum it up consistency of ignition is what gives low ES and SD velocity figures. In other words, the bullet does the same thing every time from chambering to departure... We run into that more and more at the weird ends of reloading, like reduced loads and subsonics where case fill is so light that you run almost intentionally into these issues and then have to work around them like with crimping for consistency.
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