Re: 338 edge semiauto
If it was me, I would send him the brass/dies/bullets and pay him to do alittle load developement for you. I am actually surprised he would want to should ammo that you loaded. I would think he would want to do it himself in order to see what works, and how it functions, and be able to control pressure signs.
Is this an AR platform you are building ?
If so, bolt action loads will not ably, and you need to do load developement from square one.