So my WW 308 win brass has been fired 3 times and decided to try and anneal without the expensive machines costing a small fortune. I think they turned out pretty good for first attempt.
Clamped drill in vise and had torch set just on the case neck/shoulder junction and ziptied the drill on very low speed(no case wobble). Dropped case into a 12mm deepwell socket and with the lights off as soon as it started to change to a semi reddish color I took it out with a pair of pliers and set in a metal bucket.
Brass was not spot clean like when using stainless media but had tumbled for 3 hours. So I think this may have to do with why the case necks appear "darker". But how far the heat traveled down case appears very consistant