With bottleneck cases, it's often a good idea to measure the case headspace (head to shoulder dimenions) with a good tool on the fired case then again after running it through a full length sizing die. Make sure the shoulder's not any further forward after sizing the case. 1 or 2 thousandths shorter in case headspace is best. Unless the chamber is too short, most full length sizing dies can be set in the press to do this.
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