I think I saw that video too - velocity was much higher than that. Those guys were drilling laser-like holes in metal targets with those pellets.
I think with a bolt-action .22, a tool made from a chamber flag to consistently seat the pellets at the same depth in the breech, and maybe a heavier pellet design - that could be a very effective combo when "normal" ammo is scarce.
I’m sure lead deposits would be an issue at some point.
Exploding squirrels.