So how did your bore measure out? Measure the piston to see how things look. Is the shiny surface wear or is it a dud forging where the unmachined areas got polished in the deburring tumbler? You'd probably get more response from the Gas forum.

I happen to check a used FS-52 liner last week and it was round within ±.0001" and was about .0003" larger toward the top, but that didn't seem to be wear.