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I've never seen a rationale for crimping bottleneck type centerfire cartridges
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I will crimp the loads that I use in my M1A and AR15....I've found that with all the slam banging around, the rounds towards the bottom of the clip can move deeper into the case. I only load bullets with a cannelure for such tasks, and crimp where the cannelure is.
As for the original question: I was making up some test loads for my .223 and checked out the directions from LEE on these dies (these are LEE RGB dies...the inexpensive set). There is a small disclaimer there that says that "some" Speer bullets shouldn't be used with "some" LEE dies, per Speer (i.e. Speer says that, not LEE)......apparently the P***** match has gotten more frenzied since I bought these dies (about 15 years ago?)