Quote Originally Posted by cynjon View Post
In order to know where the shoulder is before and after "bumping", you'll need a headspace comparator gauge such as the one from Hornady. Here's a good video that describes the process and how to use the comparator, as well as full-length sizing vs. neck sizing vs. bump sizing: https://www.youtube.com/watch?v=V2Wt8-VqeAE
Thank you for that link that answered a lot of questions and things are starting to make some sense. Is shoulder bumping something that is commonly done for semi autos or is it strictly for bolt action? Obviously those cases would only be good for the rifle they were previously fired from.

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