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Primer choice mostly depends on how easy the powder is to ignite. Also how tightly packed it is and the powder's burn rate. Some of it is fairly easy to understand and some of it seems like magic.
I will not try to school you on the principles, lest I be wrong. I hedge my choices by reading as many different manuals as I can and seeing what primers are chosen for what powders in what velocity ranges and bullet weights.
Good luck
Lost Sheep.
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