Wanted to try out some pellets in my (new to me) fx boss so i ordered a tin of Hatsan vortexbig bore supreme .30cal.After sighting in i shot some groups with them and the JSBs sent to me with the gun. I cant tell the difference and neither can the boss. I shot 1 JSB then 1 Hatsan in the same hole and again the Hatsan and the JSB fallowed it into the same hole. Both 3 shot groups at 60 yards straight out of the tin.