Cooey model 60 chamber or bolt problem

I had a single shot .22 bolt action. For some reason the barrel tenon did not have enough of an interference fit and it was secured with a grub screw. The loose tenon caused 'blow forward.' My solution was to drill the reciever and barrel tenon for a cross pin. I had to make up a fixture from square bar bored to the reciever diameter then carefully lay out the pin hole. Twas a near thing. I think I also had to weld on the reciever locking lug notch then dress it back. The indexing was a bit of a fuss, but the grub screw helped.
 
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A long firing pin won't cause a case failure.
But a firing pin with a sharp corner on it sure can. I have run into exactly one Cooey single shot that had this. Not sure if the the sharp corner was from dry firing, or how it came originally.
A few seconds of light stoning put a small radius on the corner. No more case failures.
OP, if you look for exactly where on the case head the failures are happening, that should indicate where the trouble is.
Excessive headspace will show up as an obviously thicker rim on the fired case.
 
In post 7 the OP stated:
"I'll try to explain better , the rounds chamber just fine and the bolt closes with no extra force, no case splits, when fired i got blow back."

So if no case splits there is no case failure but there is blow back?
 
There are other issues pretty specific to Cooey bolt action 22s:

The bolt handles are soldered on and easily can bend slightly within the slot they insert into before being soldered. They can in fact be knocked right out of it and completely off the bolt.

When the handle gets bent backward it increases the headspace and this can enable a blowout as the back of the casing is no longer being supported well.

Since those rifles utilize the firing pin as an ejector as well, they are quite stout and strike with authority. This makes it doubly likely to cause a rupture at the point of the pin strike, if not elsewhere on the rim.

This can be remedied by bending the bolt handle, but be prepared that if you end up completing knocking it off the bill you’ll need to silver solder it back on.

Alternatively you could buy an extra bolt and hope it has the headspace in the right ballpark. They are pretty forgiving of this since the 22LR is pretty low pressure, but it could also just repeat the same issue you originally experience.
 
Original Cooey bolt handles were fitted to a dovetail and brazed.
Winchester-Cooeys had the handle set in a recess and induction brazed. I've seen these knocked off, never an original dovetailed handle.
Bolts were fitted individually to the receiver by filing the rear surface of the bolt handle shank. Because they were individually fitted, they aren't necessarily interchangeable.
 
The majority of bolt action .22's are headspaced by the bolt having no forward/backward movement when it is closed.. The head of the bolt up tight against the barrel. If your Cooey bolt has forward/backward movement when fully closed, that is headspace. New bolts are fitted tight... and no headspace.
 
Striker said:
friend of mine had that problem with a single shot 22 he has.
Problem turned out to be that the receiver was worn down where the bolt handle touches it when you close the bolt. It allowed the bolt to move back a bit when you fired it.
built that area up with a spot of weld, file,test fit, file,test fit. It fixed the blow back issue.
Click to expand...
Exactly, my old 750 deluxe got that way in time. It's a common problem, sometimes a new bolt lessens the blowback.

There's no shortage of old cooey parts.
 
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