setting headspace on 10-22

Beater

Beater

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so had an experiance that wasnt very fun, blown rim on a 10-22.blew the extractor right off the gun
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so after measureing everything up and haveing a look at the other brass, headspace is to much id say, but i dont have any go no go gauges

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this is not a stock bolt. it is not a stock barrel. is also a tuff 22 receiver. turning the receiver upside down i can see the bolt mates correctly with the face of the barrel, all good in that department. so my question is, does anyone have any experiance with adjusting headspace on a 10-22? only way i can see to do this is remove material fron the face of the bolt?


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Correct, I can’t recall his name but a fellow on rimfirecentral does or did this. Here’s a how to if you have the means to do it

https://www.perfectunion.com/threads/headspace-your-bolt.40048/
 
.475" is almost half an inch. .0475"?

The depth of the bolt face counterbore can be reduced by dressing off the front of the bolt. That is obviously a job that must be done precisely.

Is it possible that the round fired without the bolt being completely closed?
Is the chamber mouth chamfered?
 
.0475 yes sorry. im fairly sure it was closed you can see the other rounds have the same bulge and i made shure the bolt was closed for those test fires
 
Seems like it would have to be the bolt recess or the chamber. But looks like it goes all the way into er.

It just sits the face of the bolt against the barrel.. really should be a simple thing.
 
tiriaq said:
Is the chamber mouth chamfered?
Click to expand...

That is my thought too...

Take a good picture of the mouth of the chamber...

Sometimes a bad batch of .22 ammo gets out there... maybe try a different brand...

Excessive headspace on a .22 rim fire usually results in misfires...
 
this is the first time ever for me dealing with this issue. i will see but im sure the mouth of the chamber is chamfered. 700$ IBI barrel

it blew out around the extractor area blew the extractor right off the GB bolt and damaged the reciever actually
 
My gunsmith once told me that the best way to fix a faulty 10-22 (and cheapest) is to "file it in G" and buy a new one! He's probably right. YMMV
 
zuke said:
What kind of chamber does it have?
Dirty chamber?
Try feeding 1 rd in, firing it and catch the brass and have a look at it
Click to expand...
Well if you had a look closser you would see i did that and the cases are compared there together. Chamber has less than 100 rounds through it. opps edited, my mistake i didnt post that pic sorry
 
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If the bolt is lighter weight then the factory one it may not dwell long enough when its fired and starts to cycle the action too early. Id try the factory bolt as Tiriaq suggested
 
ok tested with a ruger factory bolt today. pocket depth on this bolt measures .0435 vers the aftermarket which is .0457. considerable difference. same ammo

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Well there is the answer.
I would suggest returning the custom bolt. Shouldn't be up to you to repair it.
 
I'd be more inclined to dump the barrel rather than the bolt. That chamfer looks to me to be contributing more to the blown case than the few thou extra of depth of the bolt face.
Set your caliper to read .0025 inches. It's not a lot of extra space, and while it may be out of spec, it's not liable to be the cause of your issues.

Like as not, you just got unlucky with the lottery of case manufacturing, but adding a little extra headspace, and a lot of unsupported area at the chamber, and you are like to get the same unlucky experience in the future.
If all your cases are showing the same swelling, that seems to me like a pretty obvious sign of a problem. I would suggest that the brass started flowing to fill the available space, and ruptured as it was flowing in to the extractor groove.

It's one thing to take all the sharp edges off, another completely, to countersink the chamber to the point that it leaves the brass unsupported.

That's my two bits, anyways. For $700, I cannot fathom being happy with a chamber that leaves the brass deforming on every shot.

Maybe a chat with both part suppliers is in order...
 
Beater said:
ok tested with a ruger factory bolt today. pocket depth on this bolt measures .0435 vers the aftermarket which is .0457. considerable difference. same ammo

dyTqXw8.jpg
Click to expand...

I tried enlarging the image, but I cannot tell if the case on the right has the same expansion ahead of the rim as the case on the left. Examine the mouth of the chamber. Is it chamfered?
 
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