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but is there a die that will just bump the shoulder
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Here is the die you want to use if you are using the Lee collet die for neck sizing:
Redding .308 body die link
Yes it does size the body while bumping the shoulder, but you will need to do that from time to time anyway. When the shoulder moves forward, the body also increases in diameter. It is the same basic phenomenon.
Any way you use a FL sizing die will always work the neck more (translation - neck splits unless you anneal) due to the action of undersizing then expanding, and the runout will be greater.