They might be quiet, but not useful in anything you'd actually use for hunting.

Quote:
WARNING: These rounds are powered by the rimfire primer only. They must only be fired in handguns. If fired in rifles, the bullet may remain lodged in the barrel.
Will not cycle the slide of semi-automatic handguns
Aguila packages these as Long Rifle ammunition, but they are in fact slightly shorter than a 22 Long cartridge
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Better is the Enemy of Good Enough.
Okay, what’s your point??