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Get a torch and practice. All it will cost is a cheap propane torch and a few pieces of brass. Keep the heat low. I have about 1/2" - 3/4" of flame. .308 brass takes about 7 seconds and .223 about 5 seconds. The necks should not turn bright red, at the most a dull glow.
I put the flame on the back end of the neck where it joins the shoulder and it wraps around the neck. Heat only on the neck can't dissipate quickly and the shoulder also needs to be annealed. The heat ring shouldn't go any lower than this. (The black mark was a 450° temp crayon when I was learning to see if the heat went too far down the body.) I use a deep well socket just a little larger than the case and an adapter that fits a drill and spin them slowly. If you try this take a couple and over cook them to see what happens. Some I could smash in my fingers. Once they are over annealed, they are junk. With a little practice you will be able to get every case to look the same. I also like to cool them in water but it really doesn't matter. Water will not make brass hard or brittle.
NEVER heat any ways near the case head or let it get too hot past 1/4 down the body. Take an annealed case and a regular one and gently squeeze the necks with pliers to see if they have softened. You should easily be able to tell the difference. If this doesn't work for you, you'll have very little expense in it.
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