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MADISON,
That isn't quite true. The case does expand to fit the chamber, but after the pressure is removed it contracts somewhat. It doesn't go bact to it's prefired size, but neither does it remain the full size of the chamber. If it did, you would have to pound them out of the chamber.
After a few firings, partially resized cases will become too tight and need to be full length resized.
What Mr. Borden says is true, partially resizing is not going to make a big increase in accuracy (in most cases), nor is it any faster. What it might do is make a big difference in a revolver with oversized chambers, a condition for which there is no other easy cure. This is most often seen in 45 Colts, but I have seen a 41 Mag and sevel 357's so afflicted. If one has such a revolver, you can spend $100 getting a set of custom dies made (no carbide) and still find that the gun doesn't shoot well enough to make the investment worthwhile.
David
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