Like Matt said I don't think any Schueler round could be considered a classic British. I think I understand what Dumarc is saying with the values. You do see some rifles such as Churchill Mausers that have a big asking price simply because they are chambered in .404 whereas a similar rifle in a standard caliber is much less. At least this seems to be the case in OZ. I don't believe he is talking about a full blown custom gun. Unfortunately it is not as simple as a straight up re-barrel at least with the larger rounds and I really think by the time all is said and done you would be lucky to cover your costs.