Nosler at one time advocated partial sizing, using a full length die, maybe still do. However, it will cause the shoulder to rise, and after a few time doing this, you will find it hard to chamber that case. That can be useful, to determine exactly where to set your full length die; partial size a few cases, load and fire, repeat 2-3 times, until they chamber hard, then take your die down until they just close w/o tension.
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