I have always had the assumption that SxS barrels that did not touch or at least are very close to each other, have been cut. Picture #9, in the following listing, clearly shows the barrels are not even close to touching. The listing states 26" barrels which is verified by the Parker identification & serialization book.
http://www.gunbroker.com/Auction/Vie...Item=558052712
Still learning,
Bill