I' m hunting with 2315' s and Muzzy 115 grain 4 blades out of my Pat Dually. I' m getting 254 fps with the bow set on 65 pounds and 29 inch draw. These arrows actually weigh 540 grains and make the bow very quiet. This set up will shoot into the same hole out to 40 yards, accuracy is absolutely great and my single pin hunting sight marks are not much different than those I had for my 460 grain arrows. 77.38 foot pounds of K.E. means dirt and blood covered arrows!!