I'm can't comment on the SCAR17 since I don't own one, however I can offer you a bit of comparative data in regards to your ammo selection.
I recently evaluated the Hornady 150gr. SST through my new MWS, and it's easily one of my favorite loads for it. Its very clean shooting ammo, and has very mild recoil as well outta all the different types of .308/7.62 factory ammo Ive evaluated thus far.
I'd stick with your ammo choice if your trying to ultimately evaluate the rifle's accuracy as it's very, very capable stuff.
Good luck and stick with it, it will all come together eventually for you
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