22 rimfire headspace gauge dims

[cdhknives]

Can someone tell me the SAAMI rim thickness for commercial go and no-go gauges for the 22 rimfire?

A co worker asked me to check out a old bolt action single shot that is piercing primers. I suspect bad ammo (my Fed ammo worked fine) but I still want to check for excessive headspace, so I want to turn a set of gauges.

No commercial use, I'm an unpaid hobbyist here, so I don't think there are any infringement issues here, but my internet searches for this info fails.

Thanks in advance!

 

[ranch23]

The SAAMI site has a lot of information.

 

[cdhknives]

Doh! I've been dealing with professional standards so long I automatically assume they are pay-for-publications...especially when a search doesn't come up with them.

 

[old cone]

Doh! I've been dealing with professional standards so long I automatically assume they are pay-for-publications...especially when a search doesn't come up with them.

I machine the rim depth to .043 when cutting a chamber in liners. Seems to me the depth should be .043 to .045. That might be target dimensions. I had a similar problem with a Steven's side lever. Firing pin was too long and the block couldn't seat properly. I googled 22 rimfire chamber dimensions. Commercial dimensions are pretty loose as I recall

 

[cdhknives]

I'm working on an old Remington Model 33 single shot. The recess is in the bolt head. I measure .044" depth, but on a bolt rifle headspace is that depth+bolt gap, and there is no good way to measure the bolt gap that I have...except gauges.

The firing pin indent looks a bit deep to my untrained eye, and some of the cases come out slightly domed or ballooned on the back, so I suspect headspace issues... My 'good' ammo doesn't get pierced, but I don't doubt the guy when he says his kids got a face full of gas on several rounds.

 

[old cone]

I'm working on an old Remington Model 33 single shot. The recess is in the bolt head. I measure .044" depth, but on a bolt rifle headspace is that depth+bolt gap, and there is no good way to measure the bolt gap that I have...except gauges.

The firing pin indent looks a bit deep to my untrained eye, and some of the cases come out slightly domed or ballooned on the back, so I suspect headspace issues... My 'good' ammo doesn't get pierced, but I don't doubt the guy when he says his kids got a face full of gas on several rounds.

Use shim stock cut to size stick them on the end of the bolt with grease keep adding until you feel resistance. What you describe is probably worn parts, sloppy chamber. A lot of the older 22's were chambered for the original long rifle which was what is now called standard velocity. They were not designed for pressure generated by current 22 long Rifle High Speed.

 

[cdhknives]

Finally got 'er done. Finish is rough, as I had to draw file it a bit. Max body diameter didn't want to enter the chamber, so recheckig it repeatedly and sneaking up on the right diameter took a while. I should have hit it with some 600 grit paper to clean it up...too ready to be done.

The rifle passed, BTW. .051" rim on this no-go gage and it would feed, chamber, and eject, but the bolt would not close.

Started with 3/8" brass rod, ended with this: