I do not think the C designation is for a carbine, but rather just the design variant.

http://www.wisnersinc.com/additional...Savage_340.htm

http://books.google.com/books?id=tuV...page&q&f=false

$300 sounds like an asking price. I do not think these came with 18.5" barrels, and if that is true, then someone at some time chopped it, thus reducing its already (meager) collector value. Check how good a job the chop was, especially the crown

The rifle would be an OK buy at $225 to $250 though and you will like it. I have a Stevens model 325 30-30 that is pleasant to shoot, easy to carry, and accurate enough at the typical 30-30 ranges.