A .338 Blackout with an extreme 1 in 3 inch barrel twist rate.

Not using gel like in the video, how unstable are those projectiles if they hit heavy bone? Used on a Cape Buffalo? But not shown on a video. In reality shooting a cake buffalo. .338 at 2100 fps bullet is no big deal 90% of the time. A 7x57 can kill a buffalo.

Different. I don't have the knowledge to cut through the hype to the facts.