The .22 magnum is more powerful, longer and a larger diameter than the .22lr. The magnumcartridge does not use the "heel seated" bullet of the .22 LR, and USUALLY has jacketed bullets. The full name is .22 WMRF (Winchester magnum rim fire) and they do NOT interchange with .22 LR. There have been a few revolvers built with two different cylinders to permit switching between LR and Magnum.
Actually it's case is slightly fatter and it contains a LOT more powder!
Length of the case. <><><> Despite the similar names, .22 Magnum also has a slightly larger diameter than a caliber 22. LR cartridge.
The size of the 22 bullet overall. 22's come in .22 short, 22 and .22 long. They also come in .22 magnum. The 22 long guns can usually shoot a standard .22 and .22 short but not the other way around. The .22 magnum requires a different cylinder, it's larger than the other .22 shells.
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WMR stands for Winchester Magnum Rimfire- and is the proper name for the 22 Magnum. They are the same cartridge. The 22 WRF is the Winchester rimfire, and is a shorter, less powerful version of the 22 magnum.
No. .22 Magnum may only be fired in a gun Marked .22 Magnum or .22 WMRF. Different length and diameter- as well as power.
The 44 Magnum case is a little longer.
Projectile diameter.
Bullet diameter, case length.
There are revolvers made with 2 cylinders that can switch back and forth between LR and Magnum ammo. However, those have a barrel bored to magnum specs. Simply adding a magnum cylinder to a 22 LR is not safe.