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Weighing primers the Ingenuity way

How do you determine, if the weight differences are being caused by the priming compound vs other components?
That's a very good question. :) The answer lies in the velocity variance one can see when comparing the lightest to the heaviest within a brick of primers. The variance isn't large, but it detectable as shown in different people's testing, including my own, which all results pretty much line up.

Also, when I look at their numbers and my numbers, a couple of those primer outliers mixed in with, say 50 load rounds, can been seen as a discernable higher SD for those 50 rounds compared to 50 rounds using primers of the same weight. And it's repeatable.
 
How do you determine, if the weight differences are being caused by the priming compound vs other components?
That’s not really necessary, I sort all my primers in ‘gram mode’ and just shoot them in their batches, culling extremes.
It’s been proven at longer range several times that the heaviest have a different point of impact then the lightest.
 

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