I have seen just about everything on this post....trying to get the same speed they get will be very hard to do....for 1. they are in a controled enviornment....a cold bow will shoot faster then a hot bow.....shooting through the top of the chrony verses the middle and the bottom makes a difference...also the distance from the chrony will also make a difference. Also the set on the let off ...higher let off = slower bow...And like what was mentioned in a earlier post the difference in machines....does not matter if its the same one or not...there are 3 different bow shops around here with the same chrony and you will get 3 different readings...

The fps on the bows are just a guide line for you to follow as a rating of there preformance. My Extreme Solo had a rating of 325-333 fps and the BC was 328 fps but this is just a guide..do i shoot 328 fps...NO!!!! I shoot a 450 gr arrow at 70.2# @ 295 fps with a 30" draw

Is that what the rating said....no its not....anyone who shoots a bow with that light of an arrow IMO is crazy....that light of arrow looses its energy alot faster then a heavier arrow will so what it all boils down to is your ability to hit your target and KE..that is whats important. And to have fun and enjoy the sport of archery

....Bob

PS.... You never mentioned if you where shooting your arrow with fletching or with out cuz that makes a difference. and as for your arrow nocks you have... loose nock/tight nock...single clip/double clip...theres to many differences