I really don't understand what you are trying to ask Stag unless you are asking why should there be a 22mag when there is already a 22lr? If thats what you are asking the best I can tell you shoot a 22lr then shoot a 22 mag. They are two different rounds and two way different power levels. After shooting a 22 mag I can't go back to shooting a 22lr the same day. The 22lr just feels so weak and under powered.
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"The difference between genius and stupidity is that genius has its limits"... Albert Einstein