Quote:
I wouldn’t consider this with any other .22 Mag semi-auto rifle, as they are all blow back actions.
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It's been a while since I owned an H&R 700, but IIRC it's a blowback also. All the pieces under the stock merely add another spring and some more reciprocating weight.
Converting it to a cartridge with twice as much pressure strikes me as being a spectacularly bad idea.