I will more than likely be shooting Federal Heavyweight 7's or possibly Hevi-Shot mag blends as these are about the best I can buy at my local gun store. 
I picked up an Indian Creek choke in .555 and a Primos Jeallyhead in .570.
Does anyone here have any experience with either of these choke and shell combinations?
			
			
			
				I shot both with HW 7s in mine and they where ok. The IC was much better then the jelly in mine. Ended up shooting a pure gold 570 non ported and a sumtoy 562 the best with the HW shells before I switched to TSS. 
Never got magblends to shoot well with any of them 
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				I haven't shot either of those shells in mine but I shot the IC .555 with TSS and it was super tight so I went with a RR .570 and have been very pleased.  Try em both and give us an update. 
			
			
			
				I shoot the Carlson's longbeard            
.578 with the federal HW 7s. It's 150-180 in 10" nice even pattern. It served me well last year. 
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