I took my grate out, even before I used the grill. I have since changed pellets once and scooped out the hopper as best I could. I would think something like 2 pounds or less. I was unable to clear the auger channel though.
Found this advice somewhere else on the web.
Get a bucket head vacuum from Homie D. Costs like 23 bucks. Get a Homie D bucket with a lid. Lids have a rubber seal that keeps contents dry. Vacuum out your “Hickory” pellets or “Apple” or “Mesquite” Or whatever is currently in there and put lid on and store them until you want.
I now have two buckets “Hickory” and “Apple”. I swap out depending on the meat and flavor I want.
So I'm assuming answer is 2-3 lbs..I'm into a 6 hr rib cook right now, and I'll see "IF" I have to add pellets. So "IF" the answer in 2-3 lbs I'm sure I would have to add. Lets see what really happens, so far 3 hrs into the [email protected] 180 extreme snoke,still plenty of pellets left?