I have a couple of commercial jigs that you mentioned that I machined/modified slightly to fit for square and tapered lugs, so it can be dealt with that way. I'm unaware of a jig that fits the Savage action precisely.
In any case, I don't see absolute precision of the lug base being perfectly parallel to the top line of the stock being critical. A degree or two of cant wouldn't seriously affect anything as I see it, whereas a warped lug or one that's otherwise not precisely perpendicular to the face of the receiver would. In that case, recoil will try to force the rifle off to one side or the other in the stock.
I suspect most of the DIY'ers here that spin their own barrels on and off, set it "eyeball good", and their rifles shoot just fine.
I seriously doubt Savage has changed practices and started grinding their lugs. I suspect they're doing some machining to clean them up after they're stamped- but they're certainly not finished to less than a tenth on a surface grinder. If you have the ability to measure flatness of the factory lug and it checks good, then it'll serve every bit the same as a ground one. As long as the damn thing is flat, that's all that matters.
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