If you have measured your case volume, and all other data is correct. Then you would alter the start pressure in order to get it to match your real world velocity.
Start pressure can be used to take into account things like different primers, higher than usual pressure due to projectile kissing the lands etc etc.
So basically, no it does not specifically cover primers, but it dosent make any difference either as you "true" it to your real velocity via start pressure.
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