Mini,
The factory cartridges are loaded to a specific velocity for a bullet weight. All you need do is find the factory velocity data on line then duplicate the velocity from a load manual. The result should be the very same accuracy. At least that is how the factories build ammo.  On the other hand what you could do is to simply use the accuracy load in the old Lyman book and 99% of the time you will have an accurate load within +- .5 grains.
Best,
Ed
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