[NWPilgrim]

You'll get a lot of varying responses. Personally I rarely crimp and never if there is no cannelure. I've found in bottleneck cartridges the neck tension itself is plenty secure for use in AR15, M1 Garands, and a PTR91.

So you might start with no crimp and see if you ever have an issue or need to do anything different. I have no feeding failures, no loose bullets, and sub-MOA accuracy with no crimp. I see no reason to add a crimp. YMMV of course.

If you add a crimp then you should understand why you are putting it there in order to know how much to apply. I believe the military specifies a cannelure and crimp on its ammo because it can be run through a machine gun that has much more violent feeding, and any hiccup will jam it up. So it may improve reliability over millions of rounds through hundreds of thousands of select fire weapons. For bolt action or semi-auto shooting I have not seen where crimping is needed.