6.5 grendel

Realize it’s only 3 shots, but very reflective of similar strings. 123CC and 27.2 AR Comp.
 

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I do not crimp the Grendel or any other AR15 or AR10 cartridge. I do own Lee FCD for several of these cartridges but have always seen better results without using them, regardless whether there is a cannelure or not in the bullet.

The only "sorta" exception is using a crimp die to remove case mouth flare when loading cast bullets. But even then no crimp is applied, just a straightening of the case mouth.
 
Everything that gets shot in one of my ARs gets a light crimp with a Lee Factory Crimp Die.

If I were getting crap accuracy, I'd reconsider using it, but I've yet to have a rifle that wouldn't shoot MOA or better (except for one BA barrel).