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This won't account for 5 grains of deviation, but it will effect accuracy.
Cartridge cases start as a punched slug of brass.
Hammered and squeezed, formed to what we use.
A friend at work had a super accurate 218 Bee that started to throw fliers.
Turned out he'd bought a new batch of brass for reloading.
I suggested the neck thickness might not be congruent.
He gave me a handfull of his brass to outside neck-turn.
One side of the case was thicker than the other side.
The bullet would not center in the bore until the neck was corrected.
Cartridge cases start as a punched slug of brass.
Hammered and squeezed, formed to what we use.
A friend at work had a super accurate 218 Bee that started to throw fliers.
Turned out he'd bought a new batch of brass for reloading.
I suggested the neck thickness might not be congruent.
He gave me a handfull of his brass to outside neck-turn.
One side of the case was thicker than the other side.
The bullet would not center in the bore until the neck was corrected.