Setback is not a problem if you pay attention to case neck tension. Without it no crimp is going to hold the bullet in place. Cannellures are a good idea but adds another step to the manufacturing process.(which is most probably why it went away) Rotating a setback round and shooting it "later" isn't going to save you either. If you see a setback round do not shoot it because if you chamber it again it will most likely just setback some more - maybe enough to blow your chamber. Setback is prevalent now because the ammo companies have lowered their QC and inspection process and a lot more people are carrying autos now and believing that it's OK to unload and reload the same round repeatedly in their daily routine. With factory ammo you are taking a serious risk rechambering the same round multiple times. It's not worth it.
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