https://youtu.be/E60but7NXw0
I like what he said about crimp. Never liked crimp in a rifle load.
When using iffy quality brass, a crimp actually improves dispersion.
That only works if the bullets in question have a cannelure. Also, you are then licked to a specific overall length.
If you dont overdo the pressure the Lee Collet Crimping Die helps with better grip and reduces ES. You don't need a cannelure.
Quote from: Tripodmvr on Oct 27, 2022, 09:45 PMIf you dont overdo the pressure the Lee Collet Crimping Die helps with better grip and reduces ES. You don't need a cannelure.
With the difference in springback between lead and brass, crimping non-canelure brass does not give much improvement. And, when overdone, reduces neck-tension.
Quote from: janfred on Nov 08, 2022, 07:35 AMQuote from: Tripodmvr on Oct 27, 2022, 09:45 PMIf you dont overdo the pressure the Lee Collet Crimping Die helps with better grip and reduces ES. You don't need a cannelure.
With the difference in springback between lead and brass, crimping non-canelure brass does not give much improvement. And, when overdone, reduces neck-tension.
*************************
And I believe it increases bullet failure when used on the edge of what a cup and core bullet can do. Produces a failure start point in the bullet.