The black Remingtons, at 1oz and 1200fps, are going to be about 2 3/4 dram equivalent and push the load about 40 fps faster than the Federals. For game shooting, the usually greater chamber pressure and resultant greater recoil is likely not noticeable, but 100 rounds sporting clays, it is.
If you have a honed out bore to unsafe wall thickness, I wouldn't even shoot the gun, and I would not lessen the load chamber pressure thinking that I would find a load safe to shoot in such a gun. Nor would I own such a gun unless I was looking for a replacement barrel. Some of the Parker 20's and light 16s were factory made with down to about .021 to .024 wall thickness. I have not heard of any problems with these with Parker recommended loads.
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