I'm not a benchrest shooter but have been reloading for 40+ years. On neck tension, I bought a Forster neck tuner, ran batches of cases though the process, by hand eek I was surprised how much neck thickness varied within an identical batch of cases. I still beleive neck tension, as proxied by neck turning, and concentric ammo play well together and result in the most accurate ammo. At least in my mind based on what I've tried over the past 10 years or so. I've yet to try benchrest dies mainly because MOA or better works for me. I really don't care if my hunting rifles shoot 0.5 MOA or 1 MOA. I dont shoot beyond 400 yards so it's pointless for me to add more frustration into the hunting equation. I spend my time training and finding elk and deer rather than chasing another 0.25 MOA.

Adversity doesn't build character, it reveals it.