I took a deer with my VZ58 this past season. It's a 7.62x39. The ballistics between 300Blk and x39 is virtually identical sub 200 yards. I would have no hesitation whatsoever using a 300Blk on a whitetail. Especially in its preferred setup- using sub-sonics through a can
Can't help with the 300, but the 527 Carbine in 7.62X39 calls to me.
Grrrrr....that was on my list of things to do but missed out this deer season!
Sooooo looking forward to pounding one with my VZ-2008....she may get shelved next year in favor of the Ruger American I have in 7.62X39 though...