02-21-2023, 09:01 PM
My neck tension on my case is ran thru a expander mandrel on new brass, then neck sized with a Lee collet die, after I seat the bullet, I use a factory crimp die that just barley puts any pressure on the crimp on the neck, I don't know if it's needed or not? but it makes me feel a bit better knowing I did, my last loads I loaded awhile back I think I over crimped them and adjusted my Crimp die? I had to pull 1 bullet and it crimped a ring into the bullet, so I backed it way off! last Sunday my last loads for my 6.5GRR produced some of the best loads I have made for my rifle, I think my Collet mandrel is about 2.5k under bullet DIA, IMO 4k under may be too tight? the good thing about Lee is you can order a mandrel in any DIA you want that will replace the mandrel that came in the collet die for about $10 bucks? they use to be 5 bucks + shipping a few years ago so I don't know the cost today? but this would be a cheap way to find the correct size that would work for you IMO, I started using LEE collet dies for all my calibers a long time ago and I see no reason to use anything else that's how well they work for me!!!!