I've loaded well over 10K of Winchester/Olin 284 cases in the 284 and 6 284 based wildcat cartridges and have never had a single problem with the brass. I believe that Winchester/Olin recognizes that a significant % of their 284 brass will be wildcatted, often at max-plus pressure, so they make an extra effort to insure that it is made to the highest quality specs.

Jeff