Personally ive never had issues with proud primers with any of the rifles i load for, but i have heard of people putting their shellholder on the case before measuring BTO to rule out any issue in measurement that a proud primer could give. If your issue is cheap projectiles that have inconsistent OAL or ogives, Then thats a poor quality projectile problem & i dont believe there is going to be a way to get it shooting consistent. May be able to go through and use the comparator to measure each projectile and sort them into batches & then load accordingly for the seperate batches, But to me it seems like its probably more hassle than its worth chasing accuracy from a projectile that is going to be innacurate by design.
It may be worth selling the corelokts to somebody who can use them for their intended use (shooting game at modest ranges) & spend some money on projectiles that are less fussy with seating depth (i find ELDX/ELDM in my tikka rifles to not be overly fussy with seating depth ie big window between what works and what doesnt). Will certainly cost more per shot but is going to save you time , components (especially important in the current powder/primer climate) & headache trying to make projectiles do something they werent designed to do
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