I have a Remmy 870 20 ga. with a 26" pipe. I am tired of trying to find the Fed. Hvys in the #7s and was wondering what kind of chokes to try with this load and what I can expect from these shells compared to the Federals. I currently have a Primos Tightwad .570, Carlson's .575, Sumtoy 562-5, Rhino .575, and a Kicks .560.