When I ordered my AMNPS, I also ordered a 40 lb. bag of hickory pellets from COOKINPELLETS.COM. The first run I did was a 'blank' test (no food) and the pellets quit burning after a few hours.
I wondered about the moisture content of these pellets, so I put a tray full in the oven at 300 for an hour. That batch burned perfectly and completely for 14 hours. I ran another test with pellets right out of the bag and they went out, too. I did a fourth test with oven dried pellets and they burned perfectly like the second test.
I then discovered that a 1.5 pint Mason jar holds a tray full of pellets with almost no room to spare. This morning, I put two large baking trays full of pellets in the oven and heated them to 300* for two hours. After letting the pellets cool down to where I could just lay my hand on them, I canned them in Mason jars.
I may very well be going around the block to get across the street, but I know the 'canned' pellets are cotton dry and will burn correctly.
I've got 11 jars ready. When I get down to two or three, I'll make up another batch.