I have always just used a propane soldering torch and a cordless drill. Use a socket or something in the drill that comes up just below the shoulder to keep from getting the case head heated. Spin the case in the drill with socket slowly with just the neck and shoulder in the tip of the flame. If you do it in low light, you can see the neck and shoulder start to turn blue/orange. When that color hits the shoulder dump it into a bucket of water. Annealing will soften up the metal in the neck/shoulder area that gets work hardened from reloading several times. It will keep your case necks from splitting and keep proper tension when seating bullets. It is important not to anneal the case head. It needs to be harder.
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