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I havea winchester model 77 .22 cal semi-auto. This thing was working and shooting very well. 3 boxes of shells later its down to being a single shot because it jams after every shot. I just use it for grouse hunting so the jamming isnt a real big deal but I would like to fix it. I think it is the extractor claw. Is it to tight or to loose? Or am I wrong.
 

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The model 77 wasn't one of Winchester's brighter moves but it should perform a lot better than that. First thing I'd do is take it down and clean it really well and then lubricate it with miimal oil and see if this cures it. If not you might see the problem in the process of taking it down and putting it back together.

Semiauto rimfires need frequent cleaning to keep the action working smoothly.

GB
 

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I can testify to what a good cleaning will do. While I don't know much about your rifle, I once had an old Mossberg 22 target rifle that would misbehave anytime it got the least bit dirty inside. I was shooting lead ammo and you could be assured that after shooting between 75-100 rounds, the gun would start jamming. Some of it was the cheap ammo, but the gun just would not perform when the action got the least bit dirty. Going to a higher velocity, cleaner burning ammo may help some. Also, there's some 22 rifles that get stubborn after what appears to be a limited number of rounds, and require frequent cleaning. You may also find something that is in need of replacement while performing a thorough cleaning and oiling of the action.
 

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I own a model 77 and have had a couple of issues with it. The Model 77 is an excellent accurate rifle and has a high resale due to being a pre '64 winchester. This rifle (like any semi auto) must be cleaned thoroughly. I highly recommend the winchester model 77 gunsmith manual available on ebay for $20 bucks. It will guide you with drawn detailed pictures on complete disassmbly and reassembly. You can't go wrong. The manual is available from cornell publications. It also has problem diagnosis with remedies for tube feed and clip feed models. Semi autos should be cleaned after every use and properly lubricated. The cartride lifter assembly is subjected to carbon and should be disassembled cleaned and oiled. Get the book, it's worth it.
 
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