I use the Hornady tool for measuring/checking for runout. It has the ability to push the bullet over with a lever so as to correct the runout. However, I have also read that doing so is not as good as it sounds. Apparently doing so makes matters worse (or at least, not better) because you damage the seal of the bullet in the neck (or something like that) and therefore negate whatever advantage you created by reducing the runout. I don't know if that is true because I have never tested my own work. I just decided it might be true and therefore just use it to confirm that I DON"T have a runout problem. So far, I have had good luck using good brass (Lapua) and Lee Collet Neck Sizer dies (when able), and shoulder bumbing when necessary. I also anneal every 3 times.
So, I guess I am saying use your gage/tool to check, but don't bother trying to correct runout by bending or pressing a completed cartridge. Find a solution before you get to that point. Use your gage for sorting and confirming.
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