I had the chronograph out as I was doing some load developing on one of my rifles and decided to shoot my longbows through it. The bows I shoot now are 50-52 lbs at my 26" draw length with arrow weight 575 grn. I got a whopping 145 fps Good thing I didn't do this years ago I might have questioned its effectiveness Anyway I was a little surprised at the fps and would have guessed closer to 170.