Ed, they will tube a 20 to 28, but the chambers and extractors are a bit fragile and need extra care when using them.  Also, heavy loads are discouraged. I have always chosen to tube 20s to .410d, leaving my 28 gauge tubing to the 16 gauge.  However, I don't see any mention of fragile 28 gauge tubes on their website.  Call and ask.
		 
		
		
		
		
		
		
		
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