Yes, so the big aperture bit of this footage has been used in an earlier Extra Vid. But what are these Extra Vids for, if not for re-cycling footage to illustrate specific points? In this case, that the Lee-Enfield No.4 big aperture isn't less accurate than the small aperture to any meaningful degree. If you understand this and concentrate!

Here's the Canadian 1945 manual referred to: https://drive.google.com/open?id=1i-5B_VJTdzbGVBBNbBV9ASvsMMw1Znza

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Music Created By : EternalSushi
Song Title: Undertale - Megalovania Elevator Jazz
Credit link: https://goo.gl/PrF6MA
License: https://creativecommons.org

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Keywords:
.303 British sights smle