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Old January 4, 2020, 06:09 AM   #13
JohnKSa
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Join Date: February 12, 2001
Location: DFW Area
Posts: 22,949
Depends on the gun and the ammo.

At one point I found a recommendation by one ammo-maker that stated they felt their premium self-defense ammo should tolerate being chambered 4 times before it began to setback.

But that doesn't mean all ammo will handle that. I've found some budget practice ammo that would set back noticeably from being chambered just once.

Some loadings are more touchy about setback than others. Where you're most likely to get into trouble is with short cases and heavy bullets. In other words, when there's not much space behind the bullet in the case to begin with. When the round doesn't have much space in the cartridge behind the bullet, even a relatively small amount of setback can result in a large relative decrease in volume and that's when things can get dangerous.
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