Watched a couple of his other videos and learned the difference between a clip, which was used to load the 1898 era Garand, and the Magazine we use today.
At about min. 16:20 in this video he shows how a clip of 30-06 rounds was used to load the Garand and he explains the history of the 30-06 designation of that caliber round. Interesting stuff!
Link: http://www.youtube.com/watch?v=lXh4Qhmt3xA
Sorry about that it wa a Springfield 03 he was demonstrating the use of clips to load the rifle!