Peabody Creedmore Martini mistake.... What should I do?

So I bought, for a long price, a nice Peabody Creedmore. It has a heavy weight round barrel, in of all things .38-55.  Sorry, all my pictures are too big to post here.

I believe the barrel to be a replacement, since all the Creedmores I have seen are half octagon. 

So, do I leave it as is, rebore it to some .44 or .45 caliber, or get a half octagon barrel made? 

Does anyone know someone who's competent to make a half octagon correct replacement barrel? I have a correct Creedmore to copy from.

Thank you!

A correct Creedmoor barrel would be easy to make for any competent machinist or gunsmith. Simply begin with a full octagon and turn down the front 2/3rds or whatever is desired to round.
I've got a couple original Long-Range rifles that were nicely rebarreled with correct .44 and .45 barrels in 34" length and half octagon to match the original barrels.
Contact a gunsmith and tell him the chambering you want, and dimensions of the octagon and round parts and have one whipped out. Just make sure he's a REAL gunsmith, or competent amateur.