Things come to mind... I've never seen a long range shooter or BR shooter even THINK of using a Lee die.... and I"ve never seen either see the need for a crimp as a good thing.
I"ve run well over 100K rounds through ARs, maybe double or triple that even.... and never crimped one round.
IMHO there are better ways to skin a cat, but IF it works for you, then thats all you need to know.
I do have a handful of Lee dies collected over the years and I have done my best to not ever buy another.
