The Lee Collet Neck sizer dies work great for the situation you described. It is what I use if I need to pull bullets and then resize/reload.
In the past I have had pressure issues with crimped loads when trying to work up loads. The accuracy was erratic at times also. This was with a 243 and problem went away when I quit crimping. This was just my experience. I used to crimp a standard 30-06 load that worked great in a lot of different rifles. But if I didn't crimp using the same load my personal rifles shot it more accurately. Not a great deal more accurate, but still noticeable at 100yds.
