Old Cooey 60 issue.

[Winchested]

The firing pin on the Cooey model 60 seams to be hitting very hard but when the shot goes off the brass of the shell has back imprinted into the firing pin hole. So instead of an indent of the pin size I'm getting a protruding mark and real hard extraction.

Using Remington Golden Bullet bulk packs.

I had one that the rim actually blew out on and smoked up my glasses.

Is the spring that holds the pin bad? Or is the chamber too loose?

Never seen this. Wish I had of taken a picture of the casing.

 

[Qhergt]

Try other ammo to see if its an ammo issue

 

[aaron v]

Is there forward backward play of the bolt when it is closed?

 

[Winchested]

Try other ammo to see if its an ammo issue

I was firing the same ammo from a BL-22 and all was well, but I will try it again some time soon with winchester ammo.

Is there forward backward play of the bolt when it is closed?

No play at all and when the rear portion (hammer) of the bolt is forward there is no movement on the firing pin, you can't push it back into the pin hole like you can when the bolt is in the safe condition.

Maybe the spring is too weak in the bolt and the .22 pressure is enough to push the firing pin backwards?

 

[aaron v]

I mean when the bolt is closed. Pull the bolt handle back and forth to see if there's play between the receiver and bolt. I have some cooeys that did this and it was a headspace issue.

 

[6.5x55iswonderful]

I had the some problem with my Cooey 600. It seems they made the firing pin hole, in the bolt face, a little too large. I only had the problem with the Remington ammo, particularly the Yellowjackets, and every 100 rounds or so it would actually split the rim right near the firing pin strike from the brass expanding back into the firing pin hole, stretching it too thin. Very unnerving. Every other type of ammo I've tried has never had the problem. Headspace on my rifle checked out to be just fine.

 

[dr-snake]

I had the some problem with my Cooey 600. It seems they made the firing pin hole, in the bolt face, a little too large. I only had the problem with the Remington ammo, particularly the Yellowjackets, and every 100 rounds or so it would actually split the rim right near the firing pin strike from the brass expanding back into the firing pin hole, stretching it too thin. Very unnerving. Every other type of ammo I've tried has never had the problem. Headspace on my rifle checked out to be just fine.

i'm thinking the same, i used remington at the beginning with my 600 and a lot of problem with it( loading, non fired ammo...) switched to other brand and it work well.

 

[Winchested]

Thanks 6.5x55. Now that you have confirmed my suspicions I will agree it must be that rem makes thin rim casings as compared to Winchester or federal. I have shot this gun before and do not remember the issue but never shot rem goldens through it before.

My father in-law said it was his granddads gun from early days of production says there have prob been 10 thousands of shells trough it. Still shoots accurately.

 

[Winchested]

I mean when the bolt is closed. Pull the bolt handle back and forth to see if there's play between the receiver and bolt. I have some cooeys that did this and it was a headspace issue.

Yes that is what I did and there was no movement bolt locks in tight.

 

[6.5x55iswonderful]

Here is a picture of a Remington Yellowjacket fired from my Cooey 600. It's not super clear, but you can see the square firing pin strike in the middle of the round part that pushed back into the firing pin hole. I couldn't find a ruptured case to photograph, but when one split it was on the edge of the rim, so the small bit of escaping gas is vented to the side, not back through the firing pin hole.

 

[zimbu]

I've heard of this. Before I even finished reading your post I was suspecting remington ammo. In my experience Winchester was worse. The bullets were so loose in the brass that I couldn't get the bolt closed because the bullet chambered crooked and jammed the bolt. Needed a cleaning rod and a mallet to clear that one.

All my Cooey 60s shoot very well with Federal 40gr and American Eagle 40gr. Just the other day I tried CCI Minimags and they were also grouping very nicely at 100yd.

 

[Winchested]

Here is a picture of a Remington Yellowjacket fired from my Cooey 600. It's not super clear, but you can see the square firing pin strike in the middle of the round part that pushed back into the firing pin hole. I couldn't find a ruptured case to photograph, but when one split it was on the edge of the rim, so the small bit of escaping gas is vented to the side, not back through the firing pin hole.

Yes that is exactly how these casings looked, and one did rupture out the side of the rim.

Thanks for posting that up!

And because of the bulge it is hard as hell to extract the casing.

 

[LUTNIT]

I have two Cooey Model 60's and one has that problem. One is my great grandfathers that was purchased in the late 40's/early 50's and it's fine. The other I bought at a gun show and it's a 60's production according to the guy I bought it from.

All high velocity deform like that and 1 in 25 or so split on the rim and spit gas in my face.

Hyper velocity blow out about 1 in 3.

When the rim blows out the shot pretty much always becomes a flyer and goes way off target.

I can only shoot standard velocity ammo in it and I don't know if it's worth fixing since it only cost me $60. There is a good enough selection of standard velocity ammo (usually 1050 to 1080fps) and it seems to really like CCI high velocity shorts (1070fps) in terms of accuracy.

The only high velocity (super sonic) ammo I found that doesn't bubble out like the pic above is Federal bulk packs. I don't know if the brass is thicker or they operate at lower pressures but they fire fine. I haven't tried any high/hyper velocity CCI ammo yet and since I believe the Federal stuff is made in the same factory maybe it's just thicker brass. Will test out some Stingers next time I'm at the range.

 

[spacesaver]

Hey all,
I've had a M60 Cooey and never experienced this problem. Thanks for posting this, just another thing to be learnt about these neat old guns. I wonder if getting another bolt would solve the issue? I think Western Gun Parts here in Edmonton might have them. You could just be getting one in the same shape but you never know. Lutnit, if you're not interested in your 60 anymore please give me a shout, I'd love another one to go with my M75.
Cheers!!

 

[LUTNIT]

Oh, don't get me wrong, I like the rifle and with the right ammo (CCI high velocity round nose shorts) it's quite accurate; incredibly so considering the rifle only cost me $60.

On a note of parts compatibility though I have noticed some things when swapping parts between my two rifles. The tube mag rod from the newer one (~1960's) is very tight in the older one (~1940's) to the point of almost not fitting. The bolt from the newer one also seems thicker in the older one and when inserted is incredibly hard to turn down (pretty much have to slap it.) So if you get parts from another model 60 you may have to do some lapping of the mating surfaces to get smooth operation.