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I have a Bench Source Vertex annealing machine. I use 650 degree Tempilac to find the correct amount of time to leave the case neck in the flame. It drops the case into a pan of water so they cool down and you can handle them.
When cases are made, they're annealed several times. The key is to not get them hotter than needed or you risk annealing the head.
You can tell if you need to anneal when you cant fully size the case or if after sizing the case checks ok but within 30 minutes or so it doesnt. Another clue is that you may shave bullets when your seating them.
My Magnum rifle brass seems to work harden after about 3 reloads but I rarely needed to do the non magnums. If a case needs trimming no mater what it is I usually put them aside and when I get enough I'll anneal them and then recheck them and trim.
The cost of my annealer doesnt support the process over just buying new brass but I was intrigued by the process so I bought it and I use it more than I probably need to.
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