I have the Blue in a few of my 14.5" rifles. I do like them.
I have actually tried everything from Wolf steel cased, to some match ammo, and the rifles cycle great. H2s in the carbine length, and H in the middys.
I run Whites in my 16" middys.
I bought my first Wolf X Power spring for my DD carbine 14.5, and it is very similar, for what it's worth.