Probably should not state this (I'll get flack I'm sure) but I crimp everything including all the bottleneck rifle cartridges, cannelure or not... Not a stong, deep crimp on the conventional rounds but a light crimp.... even the 338 Lapua's I heavy crimp all my reference workups and mark the cases with a paint marker for later reference, that way my feeble memory don't have to recollect what I set the OAL at, I load for many different calibers and weapons.
My reasoning is simply that it insures that the round stays where I seat the bullet at, even if they are rattling around in my hunting jacket pocket or I happen to drop a couple.
I use Lee collet crimpers on bottleneck rounds and the conventional seat/crimp die on straightwall cases.
There, I said it. Let the pummeling begin.....