Trophyhusband,
Basic fact of life here; reloading manuals stay the same once they're printed, frozen in time the date they leave the printer. Bullet lines change and evolve constantly, sometimes obviously and others strictly behind the scenes. In this case, it sounds as though Nosler added the cannelure to this bullet sometime after that manual was done. Basic fact #2, reloading manuals are out of date the first day the manufacturer sends out the first printing of their newest manual. Trust me on this, been there several times. Lag time between final proof readings, print layout and the dozens of other things that go into producing a manual just make this a fact of life. Not a big deal, but something to be aware of.
As for crimping, I don't do it at all for the vast, vast majority of my rifle reloading, and that includes a tremendous amount of loading for auto rifles. No need to, assuming you're applying enough neck tension to begin with. If I do add a crimp in such cases, it's usually a taper crimp, and is set to about the least I can get away with and still call it "crimped." A little is good, less is better, and none is best of all, in my book. That's for rifles. Pistols (and some types of rifles) are different. There, you NEED a crimp.
I'm with Sidecar about the Lee equipment. Don't like it, don't use it . . . for the most part. But blind pigs do find acorns, and I have to say their Factory Crimp Dies are terrific. I don't mess with them for rifles, but in pistols (specifically autoloaders) I wouldn't think of setting up a run without them. Between those, and the extensive use of Wilson gages, you may well never experience a jam caused by ammo again, in a decently functioning pistol. The utilize a carbide sizer at the base, which actually sizes the finished round as the crimp is being applied, as well as giving a proper (adjustable degree) of crimp appropriate for the type of case being reloaded. In working with a 454 Casull and some other very heavy kickers in the range some years back, the Lee FCDs were literally THE ONLY crimp dies capable of applying enough crimp to prevent the bullets from being pulled under recoil. I recommend them wholeheartedly.