The UK's Finest Independent Forum for Shooters and Gun Owners. Est 2010.

I can see why annealing brass is attractive and I know many people do it - it certainly makes the brass easier to work with. Not sure though how easy it would be to control the heating process. Generally the ideal annealing temperature for brass is 500-550 centigrade. If you overheat the brass (or any metal) and/or heat it for too long than it will go past its recrystalisation phase and the grain of the metal will become too coarse. It will loose the mechanical properties that it once had.
Not sure whether this really matters or not when considering the amount you displace the brass when resizing.
Might be worth thinking about though.
I have been known to over analyse things but I think that is why I chose engineering for my day job.

I built one for a friend using a car window motor and a worn out brake disc.

I myself just stand them up in an old baking tray with an inch of water. Get a rhythm going and i can do 100 cases in 10mins.

Since starting to anneal each and every time, i have a set of Nosler 308 cases which have just been re-loaded for the 12th time without any sign of cracks, etc.