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Old September 1, 2010, 01:46 PM   #2
Jim Watson
Senior Member
Join Date: October 25, 2001
Location: Alabama
Posts: 14,102
The bore is NOT the same.
.22 lr is around .222" groove diameter if not a bit under.
.22 WMR is .224", same as most .22 centerfires.

Is the Cricket strong enough to stand swaging the bullet down? I dunno.

The rim diameter of .22 WRM is larger than .22 lr. Will that mean the firing pin would not hit near enough the edge of the rim for reliable ignition. I dunno, but you should before you start cutting steel.
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