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"Why would you believe less powder capacity is better for 103- to 108-grain bullets???
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Perhaps you are thinking I am implying I prefer less case capacity. Not exactly my preference, though tolerable.
Proper neck placement on the shank of the longer ogive bullet profile, is the goal that is being achieved from my perspective w the shorter 6mm ARC cartridge.
If we were not trying to fit the cartridge into the shorter AR magazine, or a mini action mag in the case of my CZ 527, the benefit of the set back shoulder would not exist.
