On my PG500, I can set the auger feed rate to a specific setting and let it run... If the weather were relatively stable for long enough, I could just burn one pellet for a few hours and measure the temperature and figure out relatively speaking , how hot a particular pellet might run... I would have a hard time converting that information into BTU numbers, but I could say Pellet A burns Hotter than Pellet B.
Doing that sort of thing, I can tell you that LumberJack Char Hickory pellets burn a lot hotter than standard wood pellets do... For example, a typical wood pellet will yield about 180F to 190F on a 72F day, when I run at a constant rate of 1.5 seconds on and 13.5 seconds off ( HHT = 15 for those that understand Fast Eddy controller settings ). When I run Char Hickory pellets at that same setting with similar ambient condtions, I was seeing like 225F.