Hello Shooters.  New member and enjoy the site so far.
I have a Maynard in 30-something chambering.  It's a centerfire post 1882 with extractor.  Stock and mechanicals in not bad shape, seems to be all working fine with strong hammer spring, travel cock works, firing pin seems ok.  I wish my .308 had as crisp a trigger.  Barrel bore is not horrible but barrel exterior pitted and scratched and sights were removed (yeah, I know).  The hardware for the tang sight is all there, just the sight gone.
1st question is, short of making a cast of the chamber is there a way to determine what cartridge it shoots?
If I caliper the barrel and find its 0.32" (or .35") does that mean that all the 32 cal (or 35 cal) chamberings will work with it (or is there a different chamber length for each)
If I want to just go with a replacement barrel, or a parts gun with decent barrel, are they hard to come by?  What kind of price would that command?
If I wanted to just sell it, what would be price range I should be looking for?  Mechanically ok, no screws missing, varnish on stock is not refinished (and shows it).  But barrel (28") is sketchy.  No cracks or significant scratches in buttstock, but one imperfection is a chip out of the checkering on left side of stock.  
Finally, would it be a major pain to either ship a barrel to Canada, or for me to ship rifle to buyer is US?
Thanks for your consideration.  I attached a couple email-size photos.  Working on getting better pics but for now these give you the general idea.  Haven't had any success yet getting a useful image of the bore but will keep experimenting with that.

Londonshooter
You will want to do a chamber cast not only to identify the chambering but to see what 125 years of cleaning has done to the original chamber dimensions. Slugging of the bore will also add additional information, especially if the chamber cast doesn't include the barrel.
I like the checkering pattern and it appears to be well done. Is the checkering of the flat top variety? If so, it may have been done in England.
Since the Maynard rifles are generally antiques, the US rules regarding shipping are very lenient. Isn't the situation similar in England, regarding antique rifle ownership? If so, you might find a ready market at home.
Your Maynard may be a little rough and missing some parts but this may be an advantage, if you have a desire to restore it.   It doesn't look abused and I'd bet that it would clean up nice. They are good shooters and will definitely stand out among all the Martini rifles on the firing line.
A nice reproduction tang sight is available from S&S Firearms. New barrels may be hard to find but the original Maynard barrel is probably heavy enough to clean up outside and may be accurate enough to suite your needs, without the need for a liner.
I should warn you that collecting, restoring and shooting Maynard rifles may be addicting.
Otto

LondonShooter, if you do decide to sell it, it'll probably fetch a better price up here.  I'm a Winchester single shot fan myself, and most of the rifles I see in America are priced well under what we would pay locally.   

How does the barrel look on the inside?

Chris.

And here's from the breech end.  After messing with flashlights for an hour finally figured how to do this.
Chamber is tough to photo but looks perfect.

SSShooter wrote on Mar 12^th, 2016 at 8:28pm:


How well was he shooting?  Worth the effort?  I have had a couple that leaded some and they were beatable by nonleaders   

Schuetzenmiester wrote on Mar 12^th, 2016 at 9:43pm:

Master.

It's not a 32-35 Stevens. The base is too large and it's too long. It appears to be more like a 32-40 Ballard or Winchester. The Stevens cartridge would have a base diameter of .400" and shoot a bullet of about .313-.314" diameter.  The Ballard cartridge would have a bullet of about .320-.321"diameter. Slug the barrel to see what you have.