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Old September 1, 2010, 01:57 PM   #3
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Join Date: February 13, 2006
Location: Washington state
Posts: 12,834
In addition to the bore and cartridge dimension issues Jim mentioned, most 22 LR rifles have very poor lockup. Since the 22 WMR operates at much higher pressures than 22 LR, you may run into bolt jamming, extraction difficulties, and possibly rupture a case in firing. FWIW, I have seen very few 22 LR to 22 WMR conversions over the years that worked well, most had one or more of the issues mentioned.
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