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Alan,
I'll bet the micrometer you refer to is made by RCBS. David Tubbs explained how he uses it to "shoulder bump", i.e., partial resize, his brass when reloading for high power matches. As I recall, it is a compromize between full-length resizing and neck-only resizing.
The neck gets almost completely resized and the body gets partially resized, but doesn't get "over-worked".
I used his method at our local club's varmint match for .223 in a 700V and got very good, accurate, safe loads ... and got a few more reloadings of the brass I was using (PMC).
I too would check headspace, if it's not been done, and make sure the loaded rounds are wiped dry before firing.
On second thought, I think the description of the problem makes a headspace check mandatory.
Sensop
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