Tonight I went thru a book I had in my library written by Dave Holt titled Balanced Bowhunting. Digging into the book he writes about some basic rules of thumb regarding fps vs arrow weight change and also fps vs draw weight change. I am reading that the charger has a IBO rating of 325 fps. Using Dave's rules of thumb, I come up with 277 fps out of the Charger @ 60lbs with a 540gr arrow. I think I may have made a mistake putting $150 into my old Martin Lynx. 
That would be roughly correct if you were shooting 70# and a 30" draw length. But, would not be correct if shooting 60#, a shorter draw length or a combination of the two. A 540 grain arrow shot in a Charger with 30" draw length and set at 60# would be in the neighborhood of 250 fps. Same arrow in a 29"/60# bow would be in the neighborhood of 245 fps.
While a very good and well written book, Mr. Holt wrote that book back in 1988 when AMO standards were common place and IBO standards were pretty much unheard of. 540 grain arrow is an AMO standard arrow weight. 325 fps is the Hoyt Charger's IBO rating and 251 fps is it's AMO rating. Two completely different measuring systems.
http://www.archeryexchange.com/shopcontent.asp?type=amoiboIf you were to shoot a Charger at 60# with a 300 grain IBO arrow @ 30" draw length you'd still be very close to the IBO rated speed
(321 fps). Thus the reason it has become a very well accepted standard of measure. And of course manufactures jump all over it because it makes the bows seem much faster and they sell better that way!
Now for a more practical measurement lets take a 29"/60# Hoyt Charger with a 6 grain per inch "Washington" WDFW legal minimum arrow
(360 grains). You will have a hard time achieving that at 60# from the Charger due to arrow shaft choices, but let's assume you find a matched arrow shaft that allows it. You could expect to achieve an arrow velocity of approximately 290 fps.
