Hi there, I am using 51 gns of N550 with Hornady 154 SPs at about 2940 fps from a Brno 601 and 20" barrel. Shoots them well and they secure game very well - no degrees of dead! This load seems more accurate than R17 in my rifle, no pressure signs (ie I miked all the case webs and no excessive expansion noted), the R17 was up around 3000 fps though, but very happy with the N550 load.
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