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If you are firing over a chronograph then 5 of each load at .5gr increments will waste a lot of rounds and give you a pretty sore shoulder.
With my 7mm mag I would load up 1 at each powder weight...

I would have thought your 7mm mag should be a lot more than 50% full with 2217. I use to use 71.5gr 2217 with a 162gr a-max. 300 win mag with a 168gr might need a faster powder than 2217.