Seating bullets does; however slightly, expand the case neck. If it didn't expand the neck the brass wouldn't spring back to hold the bullet secure. You needn't full length resize, just back the sizing out until only the case neck is resized. This way your case will be the same size as when you started and future loadings wii be identical to your first.
Semper Fi.
Gunnery Sergeant
Clifford L. Hughes
USMC Retired
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