The BIGGEST single factor in pressure issues that I have found is brass selection followed by bullet selection. We all can read a manual and a scale. Powder is easy. But if you are swapping load data that was developed for R-P brass let’s say and you switch to Lapua or Peterson brass, you will have pressure problems. Same goes if you are swapping Sciroccos in a load that was worked up with ELDM’s.
That’s why I find some of these stories about wild pressure problems with max published charges hard to believe sometimes. That is likely not the entire story.
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