Nice Shot at 1200 fps works great in my guns on ducks and geese.  
 
I don't know how much pressure Kent TM loads develops.  I do have a few cases of it that I use sparingly.   
 
If your Parker will withstand the the SAMMI max pressure of 12,500 for a 12 gauge is a question of much debate and analysis.  Barrel condition and wall thickness are big factors in determining how much pressure a Parker can endure.  Then there is the rather old butt stock.  It may crack under the recoil (different than pressure).   
 
If you are going to use non-toxic one can load Nice Shot at low pressures cheaper than buying Kent TM.
		 
		
		
		
		
		
		
		
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