Bobby.
I have a bunch of .40 brass. I counted out a 1000 (to ship to a buddy) weighed 23.8 lbs including the bag I put it in.
As it turns out buddy came to town so I didn't have to ship it, so I am not sure if my scale is accurate. Accurate enough I assumed......
Based on the numbers I have I would guess about 2500 brass in your bucket...... But that seems really low...... According to your numbers 1000 brass is like 10 lbs...... thats curious...... Maybe I need a new scale...
Cheers!