There was a .22-454 No.3 at a gun show here in Indiana a few years ago. It would have been an interesting project making cases for it, but I decided to pass on it. With the 16" twist barrel it would have been a short to medium range rifle and at the time I was looking to go longer range.
The French Gray finish was the result of a screw up on my part. The foam inserts in a hard case had gotten wet and after laying them out to dry for a couple of weeks, I thought they would be OK. I stored the No.3 in the case for a couple of months. The outside of the action was rusted but the stainless barrel and inside the action were OK. After sanding the surface rust off I found pitting on the action and the lever. I didn't think it would look good reblued so I sent it to EABCO in Minnesota for their French Gray finish. You can see some of the pitting in this picture but it still looks pretty good. The cartridge is a .204 Wasp with a 39 gr Sierra BlitzKing.
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Dave