According to the NRA Firearms Fact Book, "...in 1909-1910 U. S. Ordnance reports referred to the "clip" (not "magazine") of the upcoming service pistol..."
Senator Feinstein seems to have the terminology covered with:
"...a fixed magazine that can accept more than 10 rounds."
and
"...large-capacity ammunition feeding devices capable of accepting more than 10 rounds."
Senator Feinstein seems to have the terminology covered with:
"...a fixed magazine that can accept more than 10 rounds."
and
"...large-capacity ammunition feeding devices capable of accepting more than 10 rounds."