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I believe that the standard test protocol that used to be used was fire 3, and then go 3 minutes between subsequent rounds as long as your barrel stays touchable.
Things change. That may not be accepted anymore. Obviously, you may need to stretch that interval out a bit if you're firing an ultramag. what is important is that it stay hot, enough to have fully expanded the metal, but if you can't touch it, it's too hot.
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