It depends on the ammunition you are using. You have to shoot to find out.
It will be worth nothing If HELLery Clinton gets in as she is all for gun confiscations (IMHO)
No.
899.00
Winchester did not make a model 77.Could you mean model 70?,or do you refer to the ruger model 77?
Check w/ Browning, but I think you are correct- BOSS will interfere with iron sights.
100-400 USD
100-450 or so
If this is a Winchester Model 70, and I'll bet it is since that model was a bolt action available in .338 Win Mag, that serial number puts it in 1949 according to the Blue Book.
100-450 or so
ext2fs pg 338
Would greatly depend on condition.
First lets get the name right. Colman never made a model 338, Crosman did. So it's a Crosman model 338. You will need this information to get it fixed. Crosman offer a service to get older model air guns repaired. Go to the link posted below and open it. On the Crosman home page, click on "find a service center" at the bottom of the page. Then follow the instructions to locate a repair center.