The Levermatics were also chambered in .22LR & .22 Mag, and (IIRC) maybe a very few in .256 Win - but they were a drug on the market, the design being way ahead of it's time.
It was simply too new/modern, for the target market - who were, for the most part, older, conservative sportsman.
JMO, but it also didn't help that they were also ugly, compared to their competition.