Good long range magnums which could fit in your action include 264 Win, 7mm Rem, 300 Win. Any of these would be good. About the magazine, that is not as certain. I went the other way with a 7 Mag to 30-06 and 270 and they fed well. The mag had a relief cut for the belt. The rounds inserted and fed well. Another option is to change to 270 Win or 25-06 which are fine long range rounds or if you want a good wildcat with really good bullet selection is a 6.5-06. Good luck with your project.
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