No. As outlined several times before in this thread, Suicune's Special Attack is not that great, and having a boosting move really makes the possibility of using Choice Specs pretty much unnecessary. The idea is not bad, really, though is just very poor when compared to other Suicune sets and what they can actually do by not being locked into a Choiced move and by having access to a set-up move in Calm Mind.
Locking. And thanks for having brought up this to QC.