LEE dies and Speer bullets?

[Jack]

Adam, I do about the same- crimp for tube magazines and handguns, but not most centerfire cartridges. I've never seen a rationale for crimping bottleneck type centerfire cartridges- I suppose if they were very heavy recoil/dangerous game type loads, it might make sense to crimp.
I have a Lee factory crimp die for my 375 Winchester, and I use it and like it - after I took it apart and polished the toolmarks off it so it would work.

[Mr. 16 gauge]

I've never seen a rationale for crimping bottleneck type centerfire cartridges

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?)