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The question is what will have to happen to my charge weight?
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If it were me (and it aint), I'd:
Start with the 7gr of N320 in a mag case, and chrono it...
If it is within a few FPS of your 850fps Special load, then call it good...If slightly under, add another tenth of a grain and try that...Work your way back to 850 fps in tenth grain increments...
The alternative is to load the Mag cases to the same length as the special cartridges, and do not change the charge weight...
This would effectively give you near the same capacity below the bullet, but you will lose the crimp groove/cannelure and have to contend with a whole new issue...