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One thing that really helps muzzle velocity to be consistant is how the primers are seated. If they're not deep enough to compress the priming pellet between cup and anvil, they'll not detonate the same for every firing pin impact.
Another is denting them enough with the firing pin with a strong enough firing pin to do it right. Replace firing pin springs every couple years. Ensure the pin tip sticks out of the bolt face at least .060" but no more than .065".
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