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Old 03-27-2014, 06:31 PM
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Default Chamber diameter of k-22

Does anyone know what the chamber diameter of model 17's and 18's should be in the rear where the casing goes?


Mine went to about .230 after using the recommended reamer to fix tight extraction.
My no reamer guns Read about .226.

Extraction works better but it loads up with burnt crud more than before.

Is this the norm?
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Old 03-27-2014, 08:19 PM
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The dimensions fall within the SAAMI specs for 22LR. Attached is a picture of the SAAMI dimension drawing for 22LR as found on the internet. The top drawing is ammo spec and the bottom is the chamber specs. Just in case the pic is too hard to read the chamber spec is .2307 with a tolerance of +/- .002 for the dimension you asked about.
Chip King
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File Type: jpg 22LR.jpg (59.1 KB, 71 views)

Last edited by chipking; 03-27-2014 at 08:24 PM. Reason: added spec number
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Old 03-27-2014, 08:59 PM
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Nice info chipking.Mind relating where you found it? Thanks
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Old 03-27-2014, 09:02 PM
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That is interesting chip king
I just pulled a saami spec from the internet which shows the chamber spec as .227 +.002.
I measured my reamer at .230 which is .001 over on mine but in spec on yours?

I will try to find the spec that you found.

Thanks,

Frank
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Old 03-27-2014, 09:04 PM
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Chipking
I read your spec as .229 max the same as mine.
Am I missing something?
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Old 03-27-2014, 09:31 PM
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VONN Yahoo search "SAAMI dimensions 22lr" third result down is Image results. Bottom right image is 22LR specs.
AVIATOR I suspect the .227 you are reading is the chamber case mouth dimension. Go to the rear center of the chamber drawing and you will see the dimension for the rear of the chamber. .2307
I guess they centered it because the vertical datum lines in the rear already had bunches of data connected to them.
Chip King
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Old 03-27-2014, 09:54 PM
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Quote:
Originally Posted by Aviator View Post
Extraction works better but it loads up with burnt crud more than before.
Is this the norm?
This is a problem?
"Crud" where?
What ammo?
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Old 03-27-2014, 11:21 PM
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Residue inside the chambers tc.

We do have ammo out here,must be cause we are not allowed guns.
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Old 03-27-2014, 11:40 PM
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Chamber diameter of k-22 Chamber diameter of k-22 Chamber diameter of k-22 Chamber diameter of k-22 Chamber diameter of k-22  
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Yes the chambers will get dirty, but unlike before chamber reaming, you can still chamber and eject rounds. Before reaming, very little crud would cause difficult (at best) extraction and chambering. You now have a gun that's much less fussy and can be fired many more (at LEAST twice as many) rds before chamber cleaning is required.

This is a problem?
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Old 03-28-2014, 12:25 AM
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Try using the Federal bulk copper washed ammo that Walmart used to sell, for some reason that stuff works well in K22's. Almost everything else I tried would cause difficulty with chambering and extraction, nothing a good smack to the ejector rod wouldn't solve but that gets old after a while.
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Old 03-28-2014, 01:21 AM
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It seems like there would be an energy loss through the gap between the casing,chamber wall then out from the back of the cylinder.

This is an assumption by a layman.
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Old 03-28-2014, 06:41 AM
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Quote:
Originally Posted by Aviator View Post
It seems like there would be an energy loss through the gap between the casing,chamber wall then out from the back of the cylinder.
Not that my chronograph can find...

During the pertinent part (hi-pressure part) of firing a round the case is expanded out against the chamber walls to seal itself against them. Then as pressure decreases it "springs" back slightly from the chamber walls.
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Old 03-28-2014, 10:06 AM
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Interesting info.
I'm not here to sell hones or reamers. Just looking for the right way.
Brought my first reamer fixed k-22 along with one that was fixed with a hone to range and shot 80 mini-mags through each,40 from each box of ammo.
Both extracted well but the honed gun stayed clean while the reamer fixed gun got dirty and took much longer to clean.
My thought is that if the reamers were .002 smaller or near the low end of saami that would be ideal.

For now I will put some extended use on the guns. I expect the reamer advantage will be clear.
Thanks for the feedback.
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Old 03-28-2014, 10:21 AM
tomcatt51 tomcatt51 is offline
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With reamed chambers (10 shot 617) I can shoot a 225+ rd steel challenge match (without brushing chambers during the match) and have the rds still chamber and eject easily at the end. Pre-reaming I couldn't do that even with between stage chamber brushings.

The extraction problem is, in part, because we're extracting 6 or 8 or 10 rds at a time. Near as I can tell there are basically three 22 LR chamber sizes. Match, Bentz, Sport.

Match being the tightest and usually only used in bolt action rifles with good extractors.

Bentz being a bit bigger to let "match" semi-autos be able to extract rds and function.

Sport is SAAMI spec and allows easiest extraction and best, least finicky semi-auto functioning. And lets us extract 6 or 8 or 10 rds at a time from our revolvers.
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Old 03-28-2014, 11:03 AM
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Sounds right to me.
My honed gun does get sticky from time to time,even with the same ammo that worked before.
That .004 free play around the casing just seemed a little weird to me at first.
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