Arthur Langsford 22-17 squeeze bore chamber

[blackbahart]

Not sure if this goes into special projects or rim fire ?

we just finished putting together a 17 myra extruder /22-17 swager on a BSA martini rifle .It uses a 22LR cartridge in the chamber and when fired the bullet goes through the special long forcing cone chamber and out comes a 40 gr 17 cal elongated bullet .

Finished testing for function at 200 rounds at 50 yards with the 1-6 inch twist and had favorable results ,no leading in the chamber and grouping aprox an inch .haven't tested the penetration on steel plates yet.

What it is basically a 17 mach 11 with a 40 grain bullet that costs the same to shoot as 22 LR.I am going to scope it next as the peeps are only as good as my older eyes.

[JeffinNZ]

This is most intriguing.

Some the bullet swages in the barrel? Is the barrel .17cal full length with an elongated, tapered throat?

What is the muzzle velocity?

[blackbahart]

all the sizing of the bullet takes place in the chamber and the barrel is a 172 ,1 in 6 inch twist .I haven't cronied it yet ,the article does state that the cartridge will gain 200 fps over the 22 mother cartridge being shot .

It was invented in australia in the 60-70s in NSW when there was no commercial 17/20 cal rim fire cartridges ,,This is what I found on google

the reamer is readily availiable but the rifiling button was custom ground for the 1x6 twist as the regular 17 uses a 1x9 and tumbles the long heavy bullets

[Bzcraig]

Sure would like to see a recovered Boolit.

[Oreo]

Neat idea but why? What will a .17 boolit do that a .22 won't?

[enfield]

If your going to throw away that peep sight let me know, I have a BSA model 8 in need of one be sure and post some pics of recovered boolits as stated before.

[leebuilder]

Niffty. Cant wrap my head around it but i am most interested.
Love to see the recovered bullits.

[3leggedturtle]

Read about the 22 squeezing down to a 17 in rifle. Article was in a Benchrest Shooters Magazine. Thought it was neat and wish I had kept it.

[ohland]

we just finished putting together a 17 myra extruder /22-17 swager on a BSA martini rifle .It uses a 22LR cartridge in the chamber and when fired the bullet goes through the special long forcing cone chamber and out comes a 40 gr 17 cal elongated bullet

http://arcana.wikidot.com/taper-bore-gun
"The only taper bore weapon to see widespread production and use was the German sPzB41² which, despite being designated a heavy anti-tank rifle, was actually an anti-tank gun in all but name. Tapering from 28mm at the breech to 20mm at the muzzle...
Britain and the US also experimented with taper bore guns - or more accurately, taper-bore adaptors for normal guns such as the British "Littlejohn Adaptor" - but these were quickly made obsolete by the widespread deployment of APDS ammunition that did a better job at a lower price."

[blackbahart]

recovered bullets from snow bank ,melting fast in the last few days so went hunting

pic of reamer and some fired cases

[35remington]

Would be interested to see if a hollowpoint would be squeezed shut on passage, and if it was not....whether it would expand on impact as per the original configuration would.

Wet phone books would resolve the issue.

[Oreo]

Again, why do this? It's neat, but why? what's the advantage? Is the increase in sectional density enough to make it worth while?

[enfield]

Why do I have 34 different sets of dies !!

[Andrew Mason]

is a stronger than normal .22 action needed for this? or can a typical .22 action hold it?

[texaswoodworker]

Again, why do this? It's neat, but why? what's the advantage? Is the increase in sectional density enough to make it worth while?

Why do anything we do? Because we can. That's all the reason one needs.

[Oreo]

Well duh! I know that but what I'm interested in knowing is what purpose the inventor had in mind. Necessity is the mother of invention. Sure it's possible the inventor just dreamt up a pointless idea just for the proverbial giggles but more likely (s)he was trying to accomplish something particular that a regular 22lr wouldn't do.

[blackbahart]

I read about this design a few years ago and found it interesting ,here is a link to the google article that explains it
http://gunsmagazine.com/langsfords-s...bore-rimfires/

I am not sure what the pressures are and what is the best action for the project .I have a few martini rifles and the one I am using out of convenice as is a take down cadet and I can just unscrew the barrel by hand and replace the original 22 LR barrel and it is held in place by the thumb screw on the left hand side of the receiver (slow take down model 8 I believe, used by the Canadian Army cadets )

We made the barrel out of 416 SS barrel stock and it is a 6 grove 1 in 6 " twist 22 inches long and profiled to .900 to fit the fore end .I do believe it is over built but when reading on the different forms there is a lot of people expressing opinions on the pressures so we went a bit on the sturdy side to eliminate any failure .All the fired cases do not show any sign of pressure or bulging .

The real appeal for me was a 17 cal rim fire at the same cost per shot as 22 which is what it uses as the 17 mach 2 runs 12$ per box of 50 VS 22 LR at 5$ at todays prices.

[leebuilder]

Neat pics. Thanks for sharing.
I like it. Would be a great hunting rifle. Wonder what kind of effective range you could get, much better than normal 22lr, thats a big plus.

Where did you get the barrel??.
Got so many projects on the go, should start another.
I like to do un-normal stuff to learn and expand my knowlage.

[JeffinNZ]

The photos in the article are interesting. If the Stinger shot well enough and maintained its HP the extra 200fps and SD would be very favourable.
We have guys like this to thank for the options we have now.

[blackbahart]

the old fellow I hang out with is a barrel maker and I'm getting a great education on making them also .We made this barrel and hand turned the reamer as it is very fragile looking and don't want to get too brave till we get at least 3 more done .