Numrich Gun Parts Corp would be your best bet in finding a bolt for your Winchester rifle.
Winchester did not produce a Model 81 bolt action. Exactly how is your rifle marked? firstname.lastname@example.org
I'm not familiar with a "Winchester model 77". Is this a bolt action gun or a lever-action rifle? Winchester's famous bolt-action hunting rifle is called the Model 70. Their most famous lever-action guns are the 1873 and 1894 models. Ruger is a company that has a bolt-action rifle called the Model 77.
With the serial number that you have supplied,your Winchester model 70 bolt action rifle was made in the year 1989.
Your serial number indicates that your Winchester model 70 bolt action rifle was made in the year 1974.
The Winchester 25-20 caliber was first chambered in the Winchester model 1892 rifle/carbine which was made from 1892.The last chambering that I have found was in the Winchester model 43 bolt action rifle that was produced from 1949-1957.I would surmise that this caliber was available from 1892-1957.
anywhere between 500 and 700$
With the serial number that you have provided,your Winchester model 70 bolt action rifle was made in the year 1974.
I bought my Winchester model 310 22 cal. in 1974. What information do you want? Write me to email@example.com Nicola Macchia, Italy
Assuming that you are asking about a Winchester model 70 bolt action rifle?Then the serial number that you have supplied indicates that your rifle was made in the year 1990.
Best left to a gunsmith.