Whisper Reload Help, Crimping?

[AlcoholicusMaximus]

I have been having 125gr ballistic tip supersonic loads setting back. Reading the specs on my Redding dies, they are supposed to have a taper crimp built in.

[robrob]

On the redding dies you can crimp or not, depending how you adjust the bullet seating die. I might try a light crimp.

[N310toN170]

For the ultimate in accuracy neck thickness is the primary concern. Once that's ironed out I don't recommend crimping subsonic rounds but do recommend it for hypersonics. The hyper rounds are usually shorter in bullet length and are prone to setback due in part to a more violent recoil and cycling.