I think its a good deal. Simply, $350 for any decent quality rifle is a good price. The fact that its a Winchester virtually insures that you will get your money out of it, should the need ever arise.
A year or so ago I paid $300 for a used Black Shadow .30-06 with a Simmons Deerfield 3X9X40 AO scope. Its a very nice shooting rifle.
I say go for it.