TASCO
I would value your marlin rifle at between 300-350 dollars,which does not include the value of the scope.
TASCO
Nikon Prostaff is an excellent variable scope for under $250. Excellent optics, can't beat it for the price.
(See the link below)
TC is one.
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Any good scope will not come for $200 . I have got one Nightforce benchrest for under $1400 from NightforceUSA and quite happy with the decision. It will prove cheaper in the long run .Check out http://www.nightforceusa.com/nightforce-scopes.aspx
You need to give us some more information to answer your question- there are dozens of firearms that would fall under "50 rifle". If you mean a Barrett .50 caliber rifle, anywhere from $6,500 to $10,000- plus another $2000 for a scope.
It is the width of the front (objective) lens in millimeters. A 50 mm objective is just that- 50mm, or just under 2 inches, across.
If your winchester centennial rifle is unfired(new in the box) with the box and tags,its value is 675 dollars.
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The Soviets claimed that the effective range was around 3 kilometers. Your rifle has probably seen better days, and depending on whether or not you have a scope you can probably hit targets a little under a mile off