[Rockhounds] rotary tumbling

[June Young]

I am tumbling agates in a new Lortone, double 3# barrels.  When it is time to change the  course grit, #80, the bottom of the barrel still has all the grit in it.  It looks like it has not been used or broken down.  Is this normal for #80?  The other grits do not act like that. 
  Thanks for all your help and advise.
  June

       
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