Thanks for the replies. The bores in question are chromed, are on a 686S, are fixed choke, and are 24 gauge, F and IM, of all things. I had spoken with Mike Orlen quite a while ago on this. He wouldn't do it, and I don't blame him a bit, as it really is an oddball job. He didn't have the right sized carbide reamer, uncommon gauge and all, and I think he only uses bushing guided reamers, which is the right way. He stated carbide or grinding was the only way through the chrome, and wasn't confident any hone grinding would stay concentric. I can definitely see how it probably wasn't going to be a profitable exercise for him.
In asking my question above, I was thinking about taking my chances with the chrome by grinding through with a hone, and wondered if anyone out there really knew how thick or uniform the chrome plating is. Other alternatives are to either have a custom reamer made, or make some carbide blades to fit an adjustable reamer -- no small task, and probably over my head. Failing that, there are always spreader loads, I guess.
