22 mag conversion

.22 magnum conversion from .22 Long Rifle

First, when a gun manufacturer makes a .22 magnum version of a .22 LR gun, they have beef up the stressed parts of the gun, since the magnum creates much higher pressures when fired. So you better know what you're doing when you do a conversion, unless you like to risk having a bomb go off a few inches from your eyes.

Second, the .22 LR barrel has a slightly smaller diameter in the rifled section, so the .22 mag bullet is too big for it. This will tend to make the bullet want to jam in the rifling as it travels down the barrel, which will either help the gun blow up or ruin the barrel.

Therefore, simply putting a drill to the chamber will only ruin the gun.

If you want a .22 magnum, buy one that has been designed for the cartridge.
 
You would also need to alter the bolt face, since the rim diameter and thickness isn't the same.

22LR
Bullet diameter .223 in
Neck diameter .225 in
Base diameter .225 in
Rim diameter .275 in
Rim thickness .040 in
Case length .590 in
Overall length .985 in


22 MAG
Bullet diameter .224 in
Neck diameter .240 in
Base diameter .241 in
Rim diameter .291 in
Rim thickness .046 in
Case length 1.052 in
Overall length 1.35 in
 
22 mag canversion

I have a low winchester low wall that had a bad 22lr chamber, a gunsmith ran a 22 mag reamer in, it now performs very well as a 22 mag, accuracy is not bad and after a few thousand rounds still hasn't blown up. The smith that did it said he has done several. I also know of a few people who have converted Martinis using hte existing 22 lr barrels. If you start with a good action, it isn't a problem.
 
LarryG said:
First, when a gun manufacturer makes a .22 magnum version of a .22 LR gun, they have beef up the stressed parts of the gun, since the magnum creates much higher pressures when fired. So you better know what you're doing when you do a conversion, unless you like to risk having a bomb go off a few inches from your eyes.

Second, the .22 LR barrel has a slightly smaller diameter in the rifled section, so the .22 mag bullet is too big for it. This will tend to make the bullet want to jam in the rifling as it travels down the barrel, which will either help the gun blow up or ruin the barrel.

Therefore, simply putting a drill to the chamber will only ruin the gun.

If you want a .22 magnum, buy one that has been designed for the cartridge.
Click to expand...

do a little research before you spread misinformation this is a perfectly safe conversion
 
I've got a Cooey model 75 single shot of course that would be an awesome plinker in .22 mag. Does a difference of .001" in the bullet diameter really make it unsafe? I'd love a .22mag but not if it'll be dangerous.

this looks like it...
http://w w w.brownells.com/.aspx/sid=11461/pid=17646/sku/Rimfire_Rifle_Auto_Pistol_Fin__Style_fits__22_Win__RFM
 
Really, I thought cooey's would be a little weak in the action. Im getting a little excited, a single shot .22mag would be very handy. Gonna call a couple of gunsmiths to see what they think about converting the ol'75.
 
There are rifles/actions that would be suitable. Personally, I would be hesitant about converting a Cooey.
Saw a Lee Enfield No. 8 .22 training rifle that had been converted to .22 Magnum. Great example of how to turn a $800 rifle into a $300 rifle.
 
LarryG said:
First, when a gun manufacturer makes a .22 magnum version of a .22 LR gun, they have beef up the stressed parts of the gun, since the magnum creates much higher pressures when fired. So you better know what you're doing when you do a conversion, unless you like to risk having a bomb go off a few inches from your eyes.

Second, the .22 LR barrel has a slightly smaller diameter in the rifled section, so the .22 mag bullet is too big for it. This will tend to make the bullet want to jam in the rifling as it travels down the barrel, which will either help the gun blow up or ruin the barrel.

Therefore, simply putting a drill to the chamber will only ruin the gun.

If you want a .22 magnum, buy one that has been designed for the cartridge.
Click to expand...

Okay, if the barrel of a .22 magnum is different than a .22LR and it would not be safe to fire a .22 magnum through a .22LR barrel, please explain to me why many revolver manufacturers (ruger among them) have produced or currently produce revolvers that shoot .22 magnum as well as .22LR by changing nothing but the cylinder.
 
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