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Deleted member 67409
Here's a link from Empire Arms directly addressing the sporterized antique gun issue:
Pre-1899 Firearms FAQ
Obviously, a gun retailer isn't ATF.
Pre-1899 Firearms FAQ
Q: Does sporterizing or re-chambering an antique end its exemption?
A: Sporterizing, re-barreling, or re-chambering an antique gun does not effect its legal status. Thus, I
can legally sell folks Mauser sporters that have been converted to modern cartridges (like .308 Winchester!),
without having to go through the "FFL to FFL" hassle.
Obviously, a gun retailer isn't ATF.