The Zipper was hardly a renowned hunting round (for deer) because it was never offered with a stoutly constructed heavy bullet, not to mention that the 1-14" twists common in .22 varmint rifles of it's day wouldn't stabilize such a bullet anyway.
To each his own views, from each his own opinions.
The HiPower IS a fun cartridge to play with offering sufficient challenges for a rifle loony to overcome. In the hands of a cool customer in the deer woods it'll do fine.
