I had to anneal my .303 Brit brass necks every time I reloaded, otherwise they were too springy and expanded to hold the bullet and crimp properly. I just set the cases on their bases in a sink with 1/4 in water in the bottom and using a spreader on a propane torch pointed straight down went over the neck areas on a dozen or so at a time. As long as the case doesn't get hot enough to glow more than a touch you're OK with this moderate pressure cartridge.
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