Crimping a LR load?
Never would have crossed my mind.
Did Nosler suggest a crimp?
The crimp is to make neck tension more consistent. Benchrest shooters turn and size brass with great detail on neck tensions. even going as far as using a k&m with a gauge to measure force required to seat each bullet. The average shooter could care less but a crimp can in many cases make all things equal.
Put this in the list of stupid things I say. Lol.