My older bow a Mathews Switchback XT set @ 62 lbs.using a 28" Beeman #400 ICS Hunter with 100gr tip, Blazer vanes clocks 275 FPS consistently through my Chrony. Weighed arrow and it's 420grs. Also have a new Rezen 7.0 shooting same weight, 62 lbs. using 28" Beeman #340 ICS Camo Hunter with 100gr tip, Fusion Vanes approx weight 442 grs and clocked through Chrony @ 274 consistently. Go figure. if you read the IBO rule it has to be a full weight of 70 lbs, 30" arrow/draw and weigh 350 gr's to obtain the advertized speed they claim the bow will do. Do i have this right or did i miss something. Same bow but different guy using 350 gr LiteSpeed arrows 100gr tip , 28" chronyed 305 at the pro shop same day i was testing my bow. Go figure.