Quote:
I had a partial box of ammo, with 11 rounds in it (loaded last year). I put a very mild crimp on 6 rounds with a .270 Win Lee FCD, and left the other 5 as they were. There was no cannelure to crimp in, and only faint marks left on the case mouth from the FCD. There was no apparent bullet "crush", but I didn't pull any of them to double check.
At 100 yards,
the uncrimped group measured 0.862";
and the crimped group measured 1.631".
|
Just like changing anything else, you cant take an established load and make a change and expect the same results. Crimping requires a load workup, as the pressures are going to be different crimped vs uncrimped.
As for crushing bullets, I have actualy tried by grossly misadjusting the crimp die, and cant get anything more than a faint line i can barely feel with my fingernail when I pull the bullet, a far cry from that pic of those crushed 6mm bullets that always gets posted....
Like it says in the directions, once the collet is completly closed, its not going to close any more, as long as the collet is sized correctly, you are not going to crush them like that no matter how hard you press. If that was done using a lee FCD, It would take using the wrong size crimp die to do that.