Not enough sales
Have you tried a google search?
http://www.e-gunparts.com/product.asp?chrProductSKU=PDF0546
Your winchester model 77 rifle is valued at between 75-175 dollars depending on overall condition.
Blue Book of Gun Values has sn data. Also, proofhouse.com
a .22 caliber
A .177 caliber air rifle has very little recoil.
.223 caliber or 5.56mm.
No You could build a rifle in .306" or any other caliber but you are likely referring to 30.06. A 30.06 rifle is referred to as "30 Caliber" but to be accurate it is nominally .308"
Yes, I can. A Barrett M107 is a .50 caliber sniper rifle.
The Dragunov (note corrected spelling) sniper rifle is in caliber 7.62x54mmR. This is the same caliber at the Moisin-Nagant 91/30 rifle.
50 caliber