Rechambering .22 LR to .22 Mag


Firearm & Gun Forum - FireArmsTalk.com > Gunsmithing & Do-It-Yourself Projects > Gunsmithing Forum > Rechambering .22 LR to .22 Mag

Reply
 
LinkBack Thread Tools Display Modes
Old 03-01-2010, 11:54 AM   #1
Feedback Score: 0 reviews
 
Join Date: Mar 2010
Posts: 3
Default Rechambering .22 LR to .22 Mag

Hello all,

I have a question from across the pond - I'm a student in the UK, so I'm nowhere near as acquainted with terminology as you folks, please forgive me if I'm incorrect in some details

For a recent assignment, I need to reconstruct a crime scene. One of the guns found, a Smith and Wesson 22A, from trajectories of shots, seems responsible for the firing of Winchester Super-X .22 Mag. As far as I am aware, it is not possible for a .22 LR such as the Smith and Wesson to fire .22 Mag rounds, because of the increased length and girth of the cartridge case?

My question is whether it is possible to rechamber the Smith and Wesson so that it is capable of firing .22 Magnum rounds? If this is possible, any indicator of the complexity of the procedure would be incredibly useful (as this assignment is set in Britain, so the process would be DIY rather than by a professional).

Thanks ever so much for any help you can give me,

Jennifer



__________________
Skribbane is offline  
 
Reply With Quote

Join FirearmsTalk.com Today - It's Free!

Are you a firearms enthusiast? Then we hope you will join the community. You will gain access to post, create threads, private message, upload images, join groups and more.

Firearms Talk is owned and operated by fellow firearms enthusiasts. We strive to offer a non-commercial community to learn and share information.

Join FirearmsTalk.com Today! - Click Here


Old 03-01-2010, 01:37 PM   #2
Moderator
FTF_MODERATOR.png
Feedback Score: 1 reviews
 
robocop10mm's Avatar
 
Join Date: Jul 2007
Location: Austin,Texas, by God!!
Posts: 10,069
Liked 2735 Times on 1433 Posts
Likes Given: 231

Default

IF the round were to be manually loaded (one at a time), it might be possible. The magazine length would preclude the chambering of a subsequent .22 Mag round. It could chamber a follow up .22 LR round, but that round would likely split when fired and not extract/eject properly because of the oversize chamber dimensions.

The other problem is the blow back mechanism is set up for the recoil impulse of the .22 LR. The Magnum cartridge would blow back at excessive velocity causing the case to be ejected farther than normal. It also would likely open prematurely causing a blown case and possible damage to the gun.

The bolt could be modified to make it heavier to prevent the premature opening, but that would be an expensive time consuming process.

Was a fired case recovered? If not then the shooter could have modified the gun to lock closed on the loaded round. This would prevent the blown case scenario and eliminate the evidence at the scene.

Was a bullet recovered? Is it consistent with the Winchester .22 Mag bullet? Have you looked at the trajectory of a hyper velocity .22 LR round? Look at the CCI "Stinger" round and compare trajectory at handgun velocities. The two may be very close as the Magnum round will lose some of its oomph in a shorter barrel, whereas the LR "Stinger" will not lose as much.



__________________

In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball

robocop10mm is offline  
 
Reply With Quote
Old 03-01-2010, 03:15 PM   #3
Feedback Score: 0 reviews
 
Highpower's Avatar
 
Join Date: Oct 2009
Location: Upper Mississippi Valley
Posts: 1,547
Liked 355 Times on 200 Posts
Likes Given: 292

Default

Quote:
Originally Posted by robocop10mm View Post

Was a bullet recovered? Is it consistent with the Winchester .22 Mag bullet? Have you looked at the trajectory of a hyper velocity .22 LR round? Look at the CCI "Stinger" round and compare trajectory at handgun velocities. The two may be very close as the Magnum round will lose some of its oomph in a shorter barrel, whereas the LR "Stinger" will not lose as much.
I would also be interested to know what the weight and groove diameter was on the fired bullet, if in fact one was recovered - considering you would have to squeeze the larger bullet (.224) through the smaller (.222) LR bore.
__________________

Last edited by Highpower; 03-01-2010 at 03:55 PM. Reason: correction
Highpower is offline  
 
Reply With Quote
Old 03-01-2010, 05:38 PM   #4
Feedback Score: 0 reviews
 
stalkingbear's Avatar
 
Join Date: Sep 2007
Location: Lebanon,Ky
Posts: 3,621
Liked 11 Times on 10 Posts
Likes Given: 3

Default

As usual, I was beat to the punch. The Winchester Super X is a true jacketed bullet-unlike all .22LR bullets. It would be remotely possible to convert the S&W model .22A to fire the .22mag in a single shot manner BUT it wouldn't be easy and in NO way be practical. The blow back operation would be a major stumbling block in setting it up for .22 mag pressures. Also the bore would have to be slightly enlarged (both lands & grooves).

__________________

Sometimes you earthlings REALLY amaze me!

stalkingbear is offline  
 
Reply With Quote
Old 03-01-2010, 09:05 PM   #5
Feedback Score: 0 reviews
 
Join Date: Mar 2010
Posts: 3
Default

Hi everyone,

Thanks for your swift replies! In response to robocop10mm and Highpower, both fired cases and bullets are recovered and definitively stated to be the Winchester Super-X Rimfires - these, to be exact: Winchester Super-X Rimfire Ammunition X22M, 22 WMR, Full Metal Jacket, 40 GR, 1910 fps, 50 Rd/bx

If the Smith and Wesson fired rounds at all, it needs to have fired two in quick succession, which has to be impossible, taking your collective experience into consideration! I guess I need to rethink the sequence and find an alternative explanation and another (unrecovered) gun... I wonder what the likelihood of someone owning a Grendel P30 in deepest Devon is!

Many thanks all,

Jennifer

__________________
Skribbane is offline  
 
Reply With Quote
Old 03-01-2010, 09:27 PM   #6
Feedback Score: 0 reviews
 
Join Date: Mar 2010
Posts: 3
Default

Sorry, I seem to have double-posted that reply.

As an additional query, if any of you are professionally involved in gun modification and you'd be willing to put your name to the above information, would you send me a private message? It would be great to get a "personal correspondence" into the final piece of work if at all possible

Jennifer



__________________

Last edited by Skribbane; 03-02-2010 at 05:39 PM. Reason: Double post
Skribbane is offline  
 
Reply With Quote
Reply


Tags
.22 lr, .22 magnum, rechamber
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Firearms Forum Replies Last Post
rifle rechambering? hay Gunsmithing Forum 5 02-16-2009 03:57 PM
rechambering scooter382 Gunsmithing Forum 2 11-13-2007 09:54 PM