Nightforce vs Swarovski - OUCH! Not an easy determination as they are both very good. Unfortunately it is somewhat difficult to compare them head to head - they are each going after different markets. I believe that Swaro made a few tactical scope models (or Kahles) but Nightforce is not trying to hit the hunting market very seriously - mostly tactical and LR.
I must admit to never having put them head to head - the difference might be difficult to assess. They are both very good. The only 50mm scope that Nightforce makes is the 3.5-15 NXS and it is very nice. The rest of their line is 56mm. I have a 3x-12 Swaro with TDS and and the above NXS but I use them on different styles of rifles - the turrets on the NXS get a lot of use (out to 1000) whereas I rely on the range bars for hunting out to 500 with the TDS.
You have an excellent long range scope
. If it is properly focused and parallax free you can shoot paper out to 5 or 600 to learn how the bars relate to your trajectory. Then take it hunting. If you wish to shoot considerably longer you should consider a 30mm scope with 1/4 moa adjustments and turrets, power range to be determined. The Leupold 8-25 or NXS 5.5-22 come to mind.