I only use bullets with cannelures when I load for an AR and I crimp them using a Lee FCD. With a mixed bag of cases, powder dropped from a powder measure and coming off a progressive press, my blasting ammo gives me 2" groups at 100 yards. This meets my needs for this type of ammo. If I separate my cases, weigh each charge I can halve those group sizes while still crimping.
If I was shooting competition I might want better than MOA accuracy, but I doubt I'd be using off the shelf AR's and AR barrels with stock triggers at that point.
Crimping for the AR isn't to prevent the bullet from moving under recoil, it's to prevent bullet setback when the bolt forces it up the loading ramp. There just is'nt a lot of neck tension with most of the 223 cases I've loaded. Having a boat tail bullet helps force a bullet into a slightly undersized case mouth, but even then I find that the bullet isn't held that tightly.
When loading 223 for a bolt action or single shot rifle, I never use bullets with cannelures and never crimp.