When I necked 7mmwby brass down to 257wby,the necks were too thick,so I had to ream them.However,I was not using Federal nickel brass,so your results will differ.However,because your cases are nickel coated,the nickel may very well crack or chip when you neck it down.I personally,would not use nickel brass in this application.
As for converting the 7mmremmag to 7mmwby,I wouldn't bother,the difference in performance isn't worth the effort.If I was to convert the rifle,it would be to 7mmstw,as with the 28" barrel,it will give you a larger gain over the 7mmremag.
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