I do not recall gunner500's twist, or whether it is a JES rebore or what. Maybe he will remind us?
Rusty McGee and I went through the same thing you are going through on the barrel selection. Shilen was it for us. No. 5 sporter, 1:14" twist, just because. First was chromoly. Second one they slipped up and made a No. 4 stainless one for me. Strangely they decided they would not do that anymore. Maybe they got wind of my +2400 fps 400-gr Woodleigh proof load ?
I once got excited about getting some N.O.E. sizers, but they did not have anything I needed at the time, since I did not know about them when I was collecting sizers from LEE and CH4D. I am going to keep them in mind for future, as well as checking out their moulds for the .400 Whelen.
A-Team all the way. I gotta think about a backup to my .458 WinMag. The .400 Whelen will be a nice one for old age.