New chamber design

B

Bill Calfee

Gun Fool
New chamber design

CYA accuracy fool friends:

I was talking with a CYankee today and he said that on another forum he read where someone has come up with a new rimfire chamber design..

Now hang on to your hats.....

This new chamber uses straight walls, no taper, and it uses a leade angle of 2 degrees...

I mean, can you imagine a chamber without any taper.....and a 2 degree leade angle...

I mean, what will they come up with next?

I'm blown away......

Your LBK and pistol fool friend, Bill Calfee
 
JP65 said:
Wow Bill.....I'm getting on the list now, beat the rush! Wait....wait.....maybe I should check what I already have!
Hmmmm, good thing I checked!

JPatt
Click to expand...

Friend JPatt:

The first mention of using straight sided, no taper chambers, is when I published an article back in 2002.....that article is in my book..

And I've used a leade angle of 2 degrees forever.....also mentioned in my book...

Leade angles of less than 2 degrees, by the time the chamber is finished, wind up at 2 degrees anyway...

And leade angles over 2 degrees leave a "step" in the chamber once they're finished....

Friend JPatt, this is why for years I used a piloted hobb to finish my chambers...
Then my 2 degree leade stayed at exactly 2 degrees..

Hobb - Copy - Copy.jpg




Your LBK and pistol fool friend, Bill Calfee
 
Bill Calfee said:
Friend JPatt:

The first mention of using straight sided, no taper chambers, is when I published an article back in 2002.....that article is in my book..

And I've used a leade angle of 2 degrees forever.....also mentioned in my book...

Leade angles of less than 2 degrees, by the time the chamber is finished, wind up at 2 degrees anyway...

And leade angles over 2 degrees leave a "step" in the chamber once they're finished....

Friend JPatt, this is why for years I used a piloted hobb to finish my chambers...
Then my 2 degree leade stayed at exactly 2 degrees..

View attachment 6251



Your LBK and pistol fool friend, Bill Calfee
Click to expand...
Bill,
You don’t understand this is a new chamber with something different. I don’t know what and I can’t get a copy of the drawings but it has a new name on it so it has to have something special right? I was told it has straight sides and a 2 degree leade but that was all that was revealed.
TKH
 
Tony K Harper said:

It is 4 pages you will have to do some reading.

There is more : https://forum.accurateshooter.com/threads/eachus-22lr-reamer.4115070/

TKH
Click to expand...
Friend TDX:

The EACHUS 22LR reamer.

TDX, here's a quote from the originator of the Eachus reamer, from the web site you posted..

"I have used it on CZ455's, Vudoo's and RimX's. I have chambered all the barrels so a chambered round just touches the second driving band into the lands and extracts a live unfired round just fine. It has a 2 degree lead angle.."

TDX, it looks like the Eachus reamer is the ticket for CZ455's, Vudoo's and RimX's....

Your LBK and pistol fool friend, Bill Calfee
 
Bill Calfee said:
Friend TDX:

The EACHUS 22LR reamer.

TDX, here's a quote from the originator of the Eachus reamer, from the web site you posted..

"I have used it on CZ455's, Vudoo's and RimX's. I have chambered all the barrels so a chambered round just touches the second driving band into the lands and extracts a live unfired round just fine. It has a 2 degree lead angle.."

TDX, it looks like the Eachus reamer is the ticket for CZ455's, Vudoo's and RimX's....

Your LBK and pistol fool friend, Bill Calfee
Click to expand...
If it is all that in those actions I can just imagine it would be just as killer in a Turbo. I can’t think of any reason it wouldn’t. Maybe we are about to see another mile stone reached in rimfire accuracy.
 
Tony K Harper said:
If it is all that in those actions I can just imagine it would be just as killer in a Turbo. I can’t think of any reason it wouldn’t. Maybe we are about to see another mile stone reached in rimfire accuracy.
Click to expand...

Friend TDX:

Those actions are repeaters....so the chamber can't be engraved as much or they won't reliably extract.....

TDX, as you know, the finest accuracy comes when the chamber is fully engraved, leaving only enough room for the CL ring to build......

It's been this way for the past, what, 25 years now.....

I seriously doubt that RFBR schmidts like Jeff Patterson will be using the Eachus chamber when building Turbos.

Your LBK and pistol fool friend, Bill Calfee
 
We must be VERY grateful to Bill. When we got here in Finland Calfee style reamers 0,2250 and 0,2255 with straight body and 2,0 degrees leade we were going BIG step forward in 22 LR accuracy.

BR,

Timo
 
Bill Calfee said:
Friend JPatt:

The first mention of using straight sided, no taper chambers, is when I published an article back in 2002.....that article is in my book..

And I've used a leade angle of 2 degrees forever.....also mentioned in my book...

Leade angles of less than 2 degrees, by the time the chamber is finished, wind up at 2 degrees anyway...

And leade angles over 2 degrees leave a "step" in the chamber once they're finished....

Friend JPatt, this is why for years I used a piloted hobb to finish my chambers...
Then my 2 degree leade stayed at exactly 2 degrees..

View attachment 6251



Your LBK and pistol fool friend, Bill Calfee
Click to expand...

Howdy Bill,

That was an interesting post.

Especially this part:

"And leade angles over 2 degrees leave a "step" in the chamber once they're finished...."



Good catch!

How did you figure that out?

Did you see it with a loupe first, or did you feel it with a slug and then check with a loupe?

That just jumped out at me.

Take care,

Greg
 
Coming from a rimfire PRS angle , you have to consider they are not quite after the same thing as BR folks ,i have competed in PRS for years now and main thing has been a functioning feed and extraction, things have come so far that some action makers will not sell you action alone due to propensity of owners chambering xy chamber that might give accuracy but suddenly actions are not extracting and definitely not extracting live rounds ,followed by angry calls to the manufacturer on why overpriced POS is not working.
Live round extraction is q must as you often end up with round chambered when the timer beeps . Given sport is relatively new folks have been experimenting with various chamberings looking to find one that feeds and extracts while giving good accuracy. Have a look at the internet picts of these chambers some have massive ramps and chamfers made into them in desperate quest for reliable feed and extraction.

For years custom actions like Voodo and RimX smithed by XYZ smiths have to a degree been falling flat on their noses in the reliability department, large part of it are magazines but the second major component is gunplumbers cutting unsuitable chambers for the task at hand .
Its probably the main reason you still see CZ on the line and not just that you see folks investing thousands of $ into what is basically 450$ CZ's mostly on the promise of reliability, both CZ and Anschutz have 50+y of working magazine experience to them in and mounting the magazine housing and latch on to the action is part of what makes them consistent, not relying on bottom metal or chassis to have the perfect fit.


Keystone is currently the only shop using this chamber but at least on website they are talking 2.5° leade

Sounds like the Eachus chambering is a follow on to their previous one.

Knowledge Base – Keystone Accuracy

keystoneaccuracy.com keystoneaccuracy.com





Many competitors have these on all the stages ,to rapidly extract in case of malfunction while on the clock
extractor04-58747.jpg
 
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Mr.T said:
Coming from a rimfire PRS angle , you have to consider they are not quite after the same thing as BR folks ,i have competed in PRS for years now and main thing has been a functioning feed and extraction, things have come so far that some action makers will not sell you action alone due to propensity of owners chambering xy chamber that might give accuracy but suddenly actions are not extracting and definitely not extracting live rounds ,followed by angry calls to the manufacturer on why overpriced POS is not working.
Live round extraction is required as you often end up with round chambered when the timer beeps . Given sport is relatively new folks have been experimenting with various chamberings looking to find one that feeds and extracts while giving good accuracy. Have a look at the internet picts of these chambers some have massive ramps and chamfers made into them in desperate quest for reliable feed and extraction.

For years custom actions like Voodo and RimX smithed by XYZ smiths have to a degree been falling flat on their noses in the reliability department large part of it are magazines but the second major component is gunplumbers cutting unsuitable chambers for the task at hand ,its probably the only reason you still see CZ on the line and not just that you see folks investing thousands of $ into what is basicaly 450$ CZ's mostly on the promise of reliability, both CZ and Anschutz have 50+y of working magazine experience to them in and mounting the magazine housing and latch on to the action is part of what makes them consistent, not relying on bottom metal or chassis to have the perfect fit.


Keystone is currently the only shop using this chamber but at least on website they are talking 2.5° leade

Sounds like the Eachus chambering is a follow on to their previous one.

Knowledge Base – Keystone Accuracy

keystoneaccuracy.com keystoneaccuracy.com





Many competitors have these on all the stages ,to rapidly extract in case of malfunction while on the clock
extractor04-58747.jpg
Click to expand...
Am I to assume that cut out on the end of the tool is to slide between the barrel face and a stuck case rim to flick it out?

TKH
 
Tony K Harper said:
Am I to assume that cut out on the end of the tool is to slide between the barrel face and a stuck case rim to flick it out?

TKH
Click to expand...
Yes
That one is one of the more elaborate implements , many have tiny tool bit

aandjsporting.com

The Extractor

The Extractor
aandjsporting.com aandjsporting.com
extractor01__97509.1687483492.JPG



Shaped as a shell so they are held in spare ammo quiver on the side of the chassis

20230927-193206.jpg
 
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Timo said:
We must be VERY grateful to Bill. When we got here in Finland Calfee style reamers 0,2250 and 0,2255 with straight body and 2,0 degrees leade we were going BIG step forward in 22 LR accuracy.

BR,

Timo
Click to expand...

Friend gun fool Timo:

Nothing's changed, it's still the same way today after all these years.

There's really "nothing new under the sun".......as the old saying goes..

Your LBK and pistol fool friend, Bill Calfee
 
Mr.T said:
Coming from a rimfire PRS angle , you have to consider they are not quite after the same thing as BR folks ,i have competed in PRS for years now and main thing has been a functioning feed and extraction, things have come so far that some action makers will not sell you action alone due to propensity of owners chambering xy chamber that might give accuracy but suddenly actions are not extracting and definitely not extracting live rounds ,followed by angry calls to the manufacturer on why overpriced POS is not working.
Live round extraction is q must as you often end up with round chambered when the timer beeps . Given sport is relatively new folks have been experimenting with various chamberings looking to find one that feeds and extracts while giving good accuracy. Have a look at the internet picts of these chambers some have massive ramps and chamfers made into them in desperate quest for reliable feed and extraction.

For years custom actions like Voodo and RimX smithed by XYZ smiths have to a degree been falling flat on their noses in the reliability department, large part of it are magazines but the second major component is gunplumbers cutting unsuitable chambers for the task at hand .
Its probably the main reason you still see CZ on the line and not just that you see folks investing thousands of $ into what is basically 450$ CZ's mostly on the promise of reliability, both CZ and Anschutz have 50+y of working magazine experience to them in and mounting the magazine housing and latch on to the action is part of what makes them consistent, not relying on bottom metal or chassis to have the perfect fit.


Keystone is currently the only shop using this chamber but at least on website they are talking 2.5° leade

Sounds like the Eachus chambering is a follow on to their previous one.

Knowledge Base – Keystone Accuracy

keystoneaccuracy.com keystoneaccuracy.com





Many competitors have these on all the stages ,to rapidly extract in case of malfunction while on the clock
extractor04-58747.jpg
Click to expand...
I have one of those tools. It bent the first time I tried to extract a live round from a RFBR chamber 😆
 
Timo said:
We must be VERY grateful to Bill. When we got here in Finland Calfee style reamers 0,2250 and 0,2255 with straight body and 2,0 degrees leade we were going BIG step forward in 22 LR accuracy.

BR,

Timo
Click to expand...

Friend gun fool Timo:

This whole thing about short engraving length has me confused....

Why does one need to worry about pulling live rounds from a match rimfire chamber anyway?

Once the round is fired one can flip the empty out with one's fingernail if the extractors won't pull it for some reason...

So this whole line of discussion confuses me......

Your LBK and pistol fool friend, Bill Calfee
 
Bill Calfee said:
Friend gun fool Timo:

This whole thing about short engraving length has me confused....

Why does one need to worry about pulling live rounds from a match rimfire chamber anyway?

Once the round is fired one can flip the empty out with one's fingernail if the extractors won't pull it for some reason...

So this whole line of discussion confuses me......

Your LBK and pistol fool friend, Bill Calfee
Click to expand...

Chamber mentioned is used in magazine feed PRS rifles , where they compete in timed stages , you are bound to end up with bolt closed when the timer beeps, so have to extract live round there are other situations where you are extracting live rounds
 
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