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			Before NEF introduced their breakopen muzzle loader, I purchased a .45-70 barrel from a gunsmith in Little Rock.  He had reamed out the chamber and threaded it to accept a blackpowder breechblock.  It made a pretty neat rifle.  You could consider doing this with with a 30 caliber barrel for an NEF or H&R Handirifle.  I shoot cast .458 caliber bullets in mine with good results. 
 
Using a 209 shotgun primer makes it work perfectly with the NEF firing pin.  Good luck
		 
		
		
		
		
		
		
			
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				butchrx
			 
		
		
		
		
		
	
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