IMHO I do think you'll probably see 35 fps distinction in case you ran the same load again with standard primers. When you are uncomfortable, load 5 standard primed conditions, charge, seat bullet and shoot them 1st and see how it goes... I'm sure you could potentially rely on them, https://z-ndh-tchen-large-rifle94927.alltdesign.com/the-best-side-of-federal-zündhütchen-large-rifle-51119461