I concur with Darkker with a 1-9 twist rate the upper weight is about the 69 Grainers, once you get up into the 75's & up it's a crap shoot. My Savage model 12 with a 26 inch barrel has performed outstanding with 50,52,55 and 69's. From what I've learned the 1-7 twist is ideal for the 75 grainers and up weights.