Chronographed the PSE Chaos

Well I finally got the Beta Chrony set up so Michele could  run a few arrows through it with her PSE  Chaos. Her arrows are Carbon Force STL Hunter 100’s , cut at 25.5 inches, fletched with 3 blazer vanes and a 75 grain tip. Her total finished arrow weight is 280.3 grains. Her draw length is 25″ and right now she’s shooting it at 30lb draw weight. The Chaos shot 201 to 203 consistantly thru the chronograph. Not too bad I thought considering her arrows are 130 grains over the IBO minimum 5 grain per lb arrow weight!

The PSE Chaos has a factory rated IBO speed  of 289 and it’s figured at 27″ draw length (which is the maximum length it can be set at), and using 5 grains per lb arrow weight.  Assuming that she loses 10 fps for each inch of draw length that is decreased,  she has lost 20 fps due to her 25″ draw length. Also for every 30 grains of arrow weight you add you lose about 10 fps, so by her being 130 grains heavier she has lost another 43 fps or so.  If she shot a 27″ draw length and her arrows weighed in at 150 grains for her 30lb weight she would be getting around 263 which would fall 26 fps short of  the Chaos  289 IBO speed rating.

I think that this bow will do every bit of it’s factory speed rating and that some of that  26 fps loss could be made up by replacing the whisker biscuit with a  dropaway rest.  I am also pretty sure that the mongoose peep I installed with the rubber aligning tube,  and the rubber catwhisker string silencers I added,  can also account for some of  the speed loss as well.  We are about ready to crank the limbs on down to the 40lb peak weight, and most bows are most efficient at their peak weight anyway,  and at 40lbs she will only be 80 grains over IBO on arrow weight which should pick her up another 15 fps or so. Doing that should boost her kinetic energy from the 25lbs she has now to around 30lbs. 

My plans are to add on a string suppressor and lose the cat whiskers, replace the whisker biscuit with a good drop away rest, and try to get her speed up to where she can get  around  35lbs of kinetic energy at least. As long as she keeps her shots within reasonable range, waits for good broadside or quartering away shots,  she should be fine using the 85 grain Magnus Stinger Broadheads.

All in all I believe that the Chaos will do everything that PSE claims it will do and maybe more with a little tweaking. One things for sure, we are gonna keep playing with it and find out!