I'd give JES a call, he does rebores for less than a stub will cost,
Thanks for the link Tim! If I was thinkin on such a thing, and I ain't sayin I am,

but if I were I'd rather do a rebore!
a 32" BC barrel would make a dandy 50-140 Express,
Again,
IF I was thinking about such, I learned with my 45-120 that 32" is just to long for me.

28" may prove to be just about right, but them BC/TC barrels are mighty pricey. On top of that you got to pay to get them cut and crowned.

Now if someone who was thinking about this had an extra barrel laying around that he couldn't rebore for a 9.3x74R, oh I don't know, say a 26" .280, that might be doable...
Doable especially if that someone is motivated by the fact that he just happens to have a set of RCBS 50-140 dies laying around; thanks to a member like BikerBeans. Now there is a man who is mindfull of his fellow member's wants and desires!

Or maybe a temptor in disguise!