Unless said high number receiver post-dated the time when Griffin built it. I feel the value in this rifle lies primarily in the wood work and overall craftsmanship due to Mr. Griffin's talents. Replacing the receiver would certainly detract from its value somewhat, but as long as the original receiver were retained and not one whisker's worth of harm was done to Griffin's work then I could sort of support doing it.
Personally I would shoot it with some low-vel cast bullet loads occasionally and leave it go at that. I wouldn't employ it as a hunting rifle and as such wouldn't have a need/desire to ever introduce full throttle loads into its chamber.
