A slower expanding bullet would be even more apt to penetrate the jug of water than a higher speed bullet at these kind of MVs. The slower bullet may not explode the jug as violently, but it should penetrate deeper because the frontal expansion area will be smaller in diameter. I was going to suggest pulling a bullet and weighing one to see if they're short-changed on lead, but I gathered the trajectory seems to be correct. Maybe there's some powdered lead in them - on the order of lead pixie dust. That's about the only plausible explanation I can think of.
Because I believe any 100-plus grain lead-core expanding bullet I've ever shot out of any of my .25 to .375 caliber rifles would always have either pass-through penetrated a gallon jug of milk at 300 yards, or left the plastic jug in such tatters that it would be impossible to know if the bullet exited the off side or not. I think even the explosive varmint type bullets would at least explode the jug, when starting out at this kind of MV.
To fire two bullets and find them both laying there next to, or under, the jug is unreal. Which is why I'd love to see video. It's the kind of video Nosler would likely pay good money for, in order to keep the video OFF the internet Forums... if you know what I mean...
Might as well be a video of their bullet failing to pass-through penetrate an empty cardboard box.