I'm convinced the expander ball coming up and out of the case neck does more neck bending than any other event.
Back in the late 1950's people replaced the expander with a smaller one and honed the die neck diameter out to a thousandth or two smaller than the loaded round neck diameter. Bullets then seated very straight.
No commercial bullet runout gauge orients the cartridge to the indicator like they are in the chamber when fired. A chambered round fires when its shoulder is centered in the chamber shoulder. Its body at the pressure ring is typically against the chamber somewhere.
Back in the late 1950's people replaced the expander with a smaller one and honed the die neck diameter out to a thousandth or two smaller than the loaded round neck diameter. Bullets then seated very straight.
No commercial bullet runout gauge orients the cartridge to the indicator like they are in the chamber when fired. A chambered round fires when its shoulder is centered in the chamber shoulder. Its body at the pressure ring is typically against the chamber somewhere.
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