I had a Simmons Whitetail Classic 6.5x20x50 on my .17 HMR Sportster. It shoot's best with the Hornadys, next the Remingtons and lastly the CCI's ( :noway: ). I used up the CCI's to help shoot in the barrel. In my gun the CCI's just would not shoot, 1.5 to 2.5" groups at 100 yards. The Hornadys were just sub 1.0" at 100 yards. I took the scope off and put it on my .223 Handi and put an older 3x9 Bushnell on the .17 HMR for ease in lugging and hunting. The big 6.5x20 was a bit cumbersome on the woods and I have found the 3x9 is fine at my usual woods hunting ranges. I am sure the .17 HMR is capable of .5" groups at 100 yards with a bit of tweaking, good optics, good bench, and most importantly , a good shooter!!!....<><.... :grin: