May I recommend the Reloader series of powders? Varget will be much too fast and you will not be able to use up the case volume with it resulting in not so promising results. The Reloader series (like Reloader 22) will be much more compatible with your magnum. If you can get your hands on some, buy a 250 pack of RWS primers - you'll be amazed at what they will do for your groups.
Matt
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