Of course, this performance is due to impact velocity, and after the NBT has a chance to slow down, or if it was launched at non-magnum speeds to begin with, it is much more likely to perform as yours did.
I launch the 140gr at 3500fps out of my 7mmstw rifles,and the 180gr ballistic point at 3340fps out of my 300ultramags.My shots varied from 20 yards to 480 yards and not one bullet out of a total of about two dozen 140gr,and nine 180gr has failed to penetrate.Impact velocities in many cases were well above 3000fps and in some cases exceeding 3400fps.