There is a small level protruding from the bottom at the side of the magazine. Push that level back (or forward, I forget which) and the magazine comes straght out the bottom.
Woodmaster is the model. Grade are ADL, BDL.
There is no model number 3006 or 243 in the Woodmaster line. Check Remington's webiste under the Sportsman's Library.
Send me your email address for a scan of the manual.
100-1800 USD depending on EXACTLY what you have and its condition
A model 742 magazine
what is the value of a good condition .243 reminton model 7400 with a VX 1 2.5 x 7 leopold scope.
The lowest would be $399. but a gun in good shape with a decent scope could range upwards of $700.
There's a research project going on the Model 51 it's on the Remington Society of America. If you go there look under current research one of those guys can certainly help you or visit the forums on the site. I've never removed the catch, I hate taking those things apart they're a pain.
How old is it? Barrel length? How much of the finish is present? What condition is the stock in? Broad range 200-400
Try eBay or gunbroker.com
The magazine you're looking for is the same magazine as those used on the Model 7400 and Model 74. Look to Cabella's or try e-bay or Gunbroker.com.
First lets state that your rifle is a Remington model 742 Woodmaster semi-auto 30-06 rifle ,not a Winchester.these rifles normally sell in the range of 275-350 dollars depending on overall condition and a good bore.