I knew my Super Beast brake was overkill for a 300wm but it was good to see the results. I also did a 338 Lapua test and I'll post that video when I get it uploaded to my YouTube channel.
https://www.youtube.com/watch?v=_bbIxLhALws&feature=youtu.be
https://www.youtube.com/watch?v=_bbIxLhALws&feature=youtu.be