For a NIB or LNIB piece with the more common barrel lengths, 5.5", 7.5" 275-300 probably another 50 bucks or so for the 10" and 12" barrel
Winchester magnum rimfire
rf refers to rimfire,the wmrf refers to Winchester magnum rimfire.
Winchester Magnum rim fire
It's a warning to the user that the only compatible ammunition for that rifle is the .22 Winchester Magnum Rimfire (22 WMRF), and other types of .22 ammunition are NOT compatible.
This Model 676 was equipped from the factory with both a .22lr cylinder and a .22 wmrf cylinder - depending upon condition and barrel length (12" barrel commands a 20% premium) value will range from Excellent - $275 down to Fair - $75.
Most manufacturers will provide manuals that are in print free of charge. For out of production or older guns check the manufactuers website for a PDF download.
No. .22 Magnum may only be fired in a gun Marked .22 Magnum or .22 WMRF. Different length and diameter- as well as power.
It's a 22 WMRF chambered, semi-automatic, blow back rifle, with walnut stock, fixed front and ladder adjustable rear sight, receiver bridge drilled and tapped for scope mounting. Came equipped with 5 round mag. - 10 round mags also available. Finish on all known models was polished BLUE. manuf. 1975-86 Current retail values - Excellent: $300-$425 down to fair: $175.
The .22 magnum is more powerful, longer and a larger diameter than the .22lr. The magnumcartridge does not use the "heel seated" bullet of the .22 LR, and USUALLY has jacketed bullets. The full name is .22 WMRF (Winchester magnum rim fire) and they do NOT interchange with .22 LR. There have been a few revolvers built with two different cylinders to permit switching between LR and Magnum.