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There is a new round/chambering/design the NATO types are testing right now that uses a two part case with a steel head and they are claiming kaboom levels of pressure and velocity, that may be what he is speaking of.
The other possibility is a "blue pill" - also known as a proof load. Intentionally over loaded to test rifle receiver etc. BUT this process typically ignores velocity and focuses on "some idiot filled a case with super fast pistol powder, will they get a hunk of receiver in their head and die?" type testing instead of ballistics.
Finally... if you cheat and use sabots, a 55gr 223 bullet in a saboted 30-06 round was claimed as good for 4000 fps... you could maybe squeeze a bit more out of it with a 30-378 or something silly like that....
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“IN MY EXPERIENCE, SUSAN, WITHIN THEIR HEADS TOO MANY HUMANS SPEND A LOT OF TIME IN THE MIDDLE OF WARS THAT HAPPENED CENTURIES AGO.”
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