Both 22 LR and 22 Short have casings close to the bullet diameter. The 22 WRM has a casing that is larger in diameter where the bullet is nested in the casing there is a visible shoulder like you see on a 9mm. Thus using 22lr in a 22wrm caliber firearm will result in the 22lr bass to fracture or split.
Not sure if you are referring to the 22 WMR if you are yes it is a magnum
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