CCI
For no particular reason other than it's what I bought first and developed most of my loads around, I still buy mostly CCI. Besides, they are the only ones offered in strips for the RCBS Pro 2000.
For what it's worth, the only other primers I have experience with is Winchester. The CCI's are made from a harder metal it seems, and tend to seat a little meaner than the Winchesters in some cases. I prefer CCI's in a progressive for this same reason, as they don't deform as easily as the WW's.
In either case, both have given me flawless performance.
Best,
SM
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