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			I'm reasonably sure it's the gobble-stopper xtreme, with a .665 constriction.   he's using the winchester supreme 3 1/2" 2oz #5 loads.  Another good option would be their strut stopper choke (.643).  Hope that helps.
 gd
 
				__________________We hunt, not only because we want to, but because at our basest levels we must.
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