First off, welcome to the forum. I assume your working with a sporter barrel. Are you shooting three shot groups or five? Three shot groups will tell you all you need to know about a loads accuracy. A sporter barrel heats up fast, especially in a magnum caliber so I'd wait at least two minutes between shots.
I can't comment on your powder choice as I've never used it but have had good results with the old standbys like H4831, IMR and H4350, etc, in the 7mm mag.
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