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I've used 7 1/2 Rem for all my reloading in the 300 Whisper. Didn't think I needed a hot spark for such a little case. When I did a lot of reloading for my 454's, Dick Casull told me he found the 7 1/2 Rem had the hardest cups, and the Fed 205 next in hardness. Use to really load them hot in the early days, constantly stretching the primer pockets, which I have also done as well with some 300 Whisper early load developments. I found the standard primers to be more consistent for me also, and thus better accuracy. Out of my 10" blue SSK 300 Whisper, I get 2000+fps with a Nosler 150 BT, and Rem 7 1/2 primer. A little on the warm side with H110. With the old W680, velocities are just slightly under 2000fps, but primers show a lot less pressure signs. Unless your really going to push it, I think standard primers is more than enough.
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