This is something you yourself have to try side by side. I did. I found the standard primers(Federal) produce considerably tighter group than the mag primers(Federal). The most of info on loading 44mag with H110/W296 recomend mag primers and often, they say standard primers won't work under extreme cold condition. That may be true but I have never experienced it. Although, since I shoot year around and sometimes it gets 20 below, I tested Wincester large pistol, thinking they are a little hotter than Federal standard. The result was good and now I only use Winchester Large Pistol for .44mag and .41mag with H110/W296.
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