If you had a whole bunch of extractors in front of you, you could choose the one that would result in the smallest gap. But no one has that luxury. The gap is the result of the relationship between the bolt face and the bottom of the extractor. The following dimensions affect that gap:
1- Location of bolt face in relation to the claw. If a bolt was machined with the face recessed a bit too much it would widen the gap.
2- Dimensions of the extractor claw itself. If the claw is too there it grips the cartridge thin it would open the gap.
3- Location of the holes that holds the extractor pivot pin, both in the bolt and claw itself. Manufacturing tolerances in the location of those holes would also affect the gap.
Ideally, you would obtain an extractor without a hole drilled in it. Your gunsmith would then determine the proper location of the hole and drill it in the extractor. You would want the smallest gap possible that will still allow to extract a wide variety of cartridges.
Getting an undrilled extractor from Sako would be next to impossible, better have the smith manufacture a brand new one with the proper dimensions.
If you have the proper measuring equipment, measure the extractor gap vs the case you're trying to eject. Feeler gauges would be the easiest way I think. You'll know where you stand.