I wasn't able to find my notes so, out came the bore gauge for a quick check. It’s important to understand - hard numbers mean nothing (i.e., bore diameter / constriction) Geometry is the key.
The standard 12ga D grade chokes begin just shy of 2” from the muzzle. They slowly taper over the entire length of the choke. No straight section whatsoever. There is no chrome on the chokes.
My corresponding SSS chokes begin 2-9/16+ from the muzzle. They taper consistently until the choke straightens out. The last 3/8”+ is straight until the choke reaches the muzzle. The chokes are chrome-lined.
I didn't measure in a fashion to calculate actual taper per inch.
Clearly, this is a very small sample and should not be construed as being reflective of all Parker Reproductions - just what is in front of me.
That said, I will quantify my comparison by sharing that my D-grade is s/n 12-00176. My SSS is s/n 12SS-00176.
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