I gave up years ago trying to evaluate pattern % w/ the MagBlends due to the variability of the shot composition from lot to lot. A 3" shell from a recent lot contained shot sizes from 4's-9's w/ a preponderance of 6's -9's, but that alright by me, since the 40 yard patterns were nice and even w/ no voids. I haven't bought or evaluated Nitros, since EnvironMetal came out w/ the H13, 7's and MagBlends. IMO, the recoil and marginal increase in performance from my guns w/ the Nitros is not worth the cost, and I've had a few pressure issues w/ them in the past.