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I have my RCBS Rockchucker just barely cam over with an RCBS shellholder, a Redding FL sizing die, and commercial 223 brass.
My chamber just doesn't like milsurp brass even with a very shaved down shell holder to allow more shoulder bump to occur.
The shoulder of a resized milsrup case just gets stuck even if I bump the shoulder so much that the extractor will slip off and the firing pin can't reach the primer.
I have ruled out the head of the case as well as the neck length and it still doesn't help.
I can chamber a formed LC case and it gets better after being fire formed but it is pretty well stuck in the chamber on the first loading.
I've been told it is just how some chambers are.
If I form a piece of commercial brass with the press set to just cam over, the case just plops into the chamber gauge just like it should with that hollow clink sound and drops right back out when turned upside down.
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Threaded Mode