I experienced the same thing this weekend while shooting my BH's.

I switched from Magnus Stingers to Slick Tricks late last season. I shot them a few times just to make sure they were flying ok before using them. I never got a shot on anything after making the switch, so this past weekend was my first real experience shooting them for any length of time. WOW! I was putting them inside 3 inches all the way to 40 yards. I was thoroughly impressed. My field point groups at 40 yards are around 6 inches. I don't know if it was just luck, but out I had 10 arrows all within 3 inches of the bull.