Thread: 270 over penetration at close range?

I keep hearing this over and over, that at close range the .270 will just zip through a deer and leave a small exit hole.
the animal then running off and often being difficult or impossible to track.
most commonly the shooter tells me they don't believe the bullet opened up, that it acted like a fmj and drilled a .270 sized exit. because it was going too quick.
they will also say that the same ammo at 200mtrs will flatten a deer no problem, so the common belief is the excessive speed is the reason.
now for me this go's against all the research I have done on ballistics, where a bullet at excessive speed seems to over expand and lack penetration. often breaking apart.
when I question the shooter it is most commonly the 130g factory ammo in standard cup and core bullets. (fed blue box, Remington corloct, nosler bt's, hornady sst etc)
the reputation for ballistic tipped bullets is probably the worst, (nosler, sst etc)
this problem dose not seem to happen in the 7mm range of calibre's even though they have very similar diameter, weights and velocities.
I have not used the .270 extensively so I cannot comment personally but I would appreciate any comments on this phenomena
cheers
greg