I started watching the video and the background music was so annoying I closed the link. Looks interesting but if I've got to listen to that noise to find out about the rifle forget it.
Ramshot Tac, ASA2520, IMR8208XBR, Varget, RL-15, H4895. Any of these will fit the bill just fine. All of the listed powders are used by many, many High Power service rifle shooters each year including me and my 3 girls.