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OK. Forget it then.
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i'm thinking the carrier would have to be modified for the longer cartridge length. same bore dia. though. would make it easier to find ammo though.IIRC, the M90 in .22 WRF can be converted to shoot .22 WRM.
Don't try it without looking into it further.
When I was in gunsmithing school one of the other students did that conversion, and it did involve modding the carrier. Memory says he used a letter N drill bit ( dia. .302; .22 WRF/WMR rim dia. .294). That was in about 1981 so I have slept since then.
"The 22 WRF bullet diameter is actually .224, and it can be safely shot through a barrel made for the 22 LR. Bert WACA 6571L, Historian & Board of Director Member"
So a Brownell's .22 bbl liner should work, and IIRC they offer a bit you can run with a hand drill.
Not a family heirloom."Definitely an option, but not that much cheaper when talking the tools necessary to complete the job."
Yup, so my (retired) professional opinion is to live with what ya got or pay a gunsmith to do it. You are absolutely right that the effort involved negates any saving from DIY.
Or this depraved thought: is replacing the barrel an option?
Is your main interest in using it or just cherishing it as a family heirloom?