are you stuck to the canadian market , or can you branch out into other countries ?
google 460s&w levergun and there seems to be alot of interest .
even on this site , just look at all the interest in rossi's ranch hand .
i know i am just one person , but , if you had for sale the equivalent to a rossi ranch hand in 460 s&w i'd buy one , assuming the price was under 800.00 . ( the fit , finish and quality needs to be the same as a rossi ) .
if you could manage to sell these in the 450.00 range i don't think you could keep them in stock .
IIRC, .460 S&W requires a progressive twist for the rifling, otherwise it tears the bullet apart.