Depending on how old the bow is,what weight it's set at, what the draw length is, how much the arrow weighs, etc...you can expect 250-300fps. The Mirage has always been one of Browning's faster bows but there are too many variables to look at to give you a speed now. Rest assured it will be fast enough to hunt with.
Is it accurate? if you do your part, it will do it's.
Ihunt withboth newer and older Brownings and have never had a problem with them. They are great bows and will do the job......as long asyou do.
Congrats on the new bow.