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1. You can but you risk damaging the .22 magnum barrel. The magnum barrel is specially designed to take the full force of a magnum bullet, not a regular bullet. But if you try to shoot a magnum shell in the regular cylinder, you risk a blow up.
2. You can shoot .22 Long Rifle ammunition in a .22 magnum barrel safely as long as the chamber is a .22 Long Rifle chamber or the revolver cylinder is chambered for .22 LR
Many revolvers by Strum Ruger and Company, High Standard and others have interchangeable cylinders of both .22 Long Rifle and .22 magnum and use the same .22 magnum barrel.
The .22 magnum barrel is slightly larger in bore and groove dimensions than the .22 Long Rifle and may have a bit less accuracy when shooting the .22 LR.
A barrel made for only for .22 LR bullets should not fire .22 magnum ammunition, as the pressure will increase somewhat due to the slightly smaller diameter. However in practice, such barrels can and do fire .22 magnum ammunition without any other problems.
ANSI-SAAMI Z299.1-1992 specifications for .22 LR and .22 Magnum:
A) .22 Long Rifle:
Bullet Diameter - .2255
Barrel Bore Diameter - .217
Barrel Groove Diameter - .222
B) .22 Winchester Magnum:
Bullet Diameter - .2245
Barrel Bore Diameter - .219
Barrel Groove Diameter - .224
From this, you can see the .22 magnum round has a smaller specified bullet diameter but a larger groove diameter.
In actual measurements, the .22 LR expands to fit this groove sufficiently to work well.
If the .22 magnum is fired in a .22 LR barrel in theory the pressure in the chamber and barrel will be greater, but in actual tests, it is slight.
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Can you shoot Remington 38 caliber ammo in a 357 magnum pistol?
No
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Can I shoot 380acp caliber out of my 32 pistol?
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No. Only what is stamped on the barrel.
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NO!!
