for years i've been using gold tip xt 55-75 8.2 gpi. with 100 grain heads then went to gold tip traditionals xt 55-75 at 8.9 gpi this year i'm going to try carbon express maximas hunters350 i think they are 8.9 gpi. stiffer seems to fly better out of my rigs, I'm not a speed freak i look to punch all the way through!!! works best for hog hunting!!