IMHO, about the only positive attribute for this round would be that it would probably be an easy barrel swap for guns like the 10/22, 77/22, other swap barrel rimfires.
21 SHARP - New Rimfire Cartridge from Winchester -
SAAMI have published cartridge and chamber drawings of a new rimfire cartridge called 21 Sharp designed by Olin Winchester.
www.thefirearmblog.com
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