Ask yourself this. "Am I buying this ammo to shoot, or to store?"
I have yet to find out how well cheaper, or less expensive surplus ammo performs ten+ years after purchase. Honestly, my main stock is three cans of clipped, bandoliered M-855, and one mixed 5/1 855/856..
The cheaper ammo, is for PLAY. Not training, not sighting in, no serious use. For this use, Wolf, Barnaul, etc. is satisfactory.
Also, I collect ammo (or did, til I lost interest) so I have small quantities of odd 5.56 I shoot up. (Guatemalan, Canadian, some really BAD stuff made in Singapore, )
It depends on how well you can divide "working" ammo from "play" ammo, I guess. I don't fool myself into thinking cheap ammo is anything but that. Cheap.
Meplat-