Quote Originally Posted by The Joe-Man View Post
By the definition that the RCMP are using to prohibit the 50 Beowulf mags as "dual calibre", 40 S&W mags are also "dual calibre". They are "adapted from the original" 9mm "design and the ability of the magazine to perform as originally designed has not been compromised by the adaptation".
For what it's worth the .40 S&W is derived from the 10mm, so it's not technically an adaptation of the 9mm... but that's just my interpretation.... who knows.