The first thing I worry when some one says there is a little rust in the barrel and around the nipple is, the rifle was not cared for properly. Also how damaged is the barrel because of the rusting. I think $200.00 might be a little high, it depends on how bad you want the rifle.

Also you said it is a "Hawkins" rifle. That is a general term for a style of rifle. Whether the rifle is worth $200.00 would also depend on the make of the rifle. Thompson Center, Lyman, Pedersolli, Traditions, CVA, who makes the rifle?

Have you looked on the gun auction sites? I picked up a .54 caliber Thompson Center Renegade in perfect condition for $150.00 and a Hawkins .50 caliber for $175 which I think had never been fired to be honest. There are lots of good deals out there if you watch for them.