Sounds like it could be a Super Shadow since it is the black synthetic stock. More than likely a push feed as well, quality could be hit or miss as the last few years of Winchester at New Haven they had some quality issues. Doesn't mean it isn't a good rifle, just that there might be some problems that need fixed before it shoots to the fullest potential.
Another thing is that most of your .30-06 rifles at pawn shops have a lot of life left in them. It takes far more rounds to wear out a rifle than what the average joe puts down them in a lifetime. If you really want it, make them an offer 10-15% less than asking price, if they accept it or you buy it anyway. Take it home give it a good cleaning, pick up a couple boxes of different factory ammo and take it to the range.
If it doesn't shoot well check the scope and mounts first. If they are loose tighten them. Replace the scope if you have one (don't go buy one if you dont) that you know is good and see how it shoots. If still it doesn't shoot then take it to a reputable Gunsmith in your area and have him check it out. Talk it over with him what your capabilities are and your expectations and what you are willing to spend on the rifle. It might be as simple as a bedding job, trigger tune or a recrown to get your rifle up and shooting the way you want it.