I think there are a lot of variables involved in what your expectations are. The grigri plus is rated for 8.5 mm rope minimum. The safeguard is rated for 8.1 mm minimum, both are out of spec, anyone with any sense with any true skin in the game would tell you no, but we are all a little MAD around here (Alice in wonderland) just remember, the longer the rope, the more elongation, and the smaller the diameter at the bottom. You make the call. Technically the rope is out of mfg spec though