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Old December 5, 2009, 07:13 PM   #6
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Join Date: May 13, 2006
Location: WA, the left armpit of the USA
Posts: 1,323
What Frank says can certainly be true. You may find the effect on accuracy to be transitory, however. As you work the brass it will become less elastic and the expansion will be limited which will change the harmonics of the vibrations, changing the point which the muzzle has reached in its travel when the bullet exits the barrel. Since you can't have any control over how each case hardens, bullets exit on different trajectories. Annealing fairly often can mitigate the effect.

A better cure is to form the brass in such a way as to limit the amount of expansion, controlling pressure by bullet seating and/or powder charge, or even bullet slection, as Dardas mentioned.
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