Hinterfrag dich selber mal etwas mehr… ich war schon häufig in den USA und finde es ziemlich erschreckend was da z.T. abgeht. I wouldn't fret around the primer blend. There is not that much pressure difference between a Magnum primer and Common. I have attempted interchanging via a load progress. https://z-ndh-tchen-large-rifle39361.alltdesign.com/the-best-side-of-federal-100-51096895