Cooey model 39 22 lr blow by problem

Sniperphil

Sniperphil

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I have a Cooey model 39 single 22. The last time I had it out I was doing some pinking on pop cans with some new ammo, and I was getting splattered with powder residue with every shot. Anyone know anything about this and wht could be the problem?
 
I had an old Remington 12 that was my uncles. He had put so many rounds through it that the chamber had become oversize. Upon firing, the case would split lengthwise, big puff of smoke, and the bullet would spit out the barrel about 30 ft.
 
cosmic said:
I had an old Remington 12 that was my uncles. He had put so many rounds through it that the chamber had become oversize. Upon firing, the case would split lengthwise, big puff of smoke, and the bullet would spit out the barrel about 30 ft.
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That almost sounds like a Model 12C.
 
Were you using new production ammo or something that has been sitting on a shelf for ages? Did you try different types of ammo or just the one?

Hard to say if its the ammo or the gun thats the problem with the provided info...
 
Sniperphil said:
That is my thought. Any recommendations for ammo?
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I got one. Anything other than what you are using. Just to see if the problem persists.

Even a different lot number from the same maker might clear up the issue.

Getting black staining on the side of the cases? Compare the location of the staining to the firing pin imprint, see if it is consistent. If it is, that would point you at an out of round chamber. An oversized chamber (by wear or maladroit ministrations) would show the staining either randomly located, or all around the case.

Last case rupture I had (a couple years back) surprised me for two reasons. One, was that the case that blew (split the rim along the edge) was an older .22 Short, and the second reason was that I had a pretty solid record on that Cooey digesting almost anything that you could grub up in the odds and sods ammo pile. It was loud, and I was pretty happy to have my regular glasses on!

Last rifle that I had that I could say was CONSISTENT in blowing gasses towards me, was a Stevens Favorite that could only be charitably called in reasonable condition... It had been shot loose and had a visibly out of round chamber, from some prior owner's ministrations of some sort. It manifest itself in a little puff of gasses up on the underside of the brim of my ball cap when it was shot.

Would suggest removing the bolt, and seeing if there is any noticeable wear out of round of the chamber, and using a live round (or pull the bullet and dump the powder and just use the case, if you can manage to do so without bending the case up), and see in general, how well the case rests in the chamber. The back end of a Number 2, or 7/32nds(maybe easier to find) drill would also serve as a reference for such investigations, being very near the normal chamber diameter. Once in the chamber, a flashlight and a good close look should show if the out of roundness of the chamber is apparent, if at all.

In a safe place to do so, close the bolt on a case or live round, and see if the bolt will move fore and aft, watch the gap that might form between the locking surface on the back of the bolt handle, and the face of the notch it sits in when the bolt is closed. I would suggest that three or four thou, about the thickness of basic loose leaf paper, would be not worth worrying so much about, but say, fifteen to twenty thou, about the thickness of a paper match book cover, would be getting too loose.
 
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