Some folks swear by them.
I have an unused set sitting on the shelf. Early on, I thought I needed them. Turns out in my case, my Lyman die couldn't adequately set the shoulder back. Once I found this out and changed dies, I have no need for the SBD.
I have to wonder how many people shift to SBD's when maybe something else is happening. Use a method to check your shoulder bump before you decide to change to the small base set.
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