Thanks for thinking!  When I switched to Clay Dot powder and first encountered the problem after loading 2000 good shells I changed the rubber grommet, the brass washer, and the rubber shot insert in the hope of solving the problem.  I still have no idea why.  Am waiting for a red plastic baffle to arrive so I can settle on a fix.  One thing for sure is that poor shells sucks. 
 
Thanks to all for your input.
		 
		
		
		
		
		
		
		
	 |