Find a reloading recipe book for steel loads, use only the components listed, if no one lists the Xpert hulls thn you have your answer.
My older RSI book lists Federal Gold Medal's as the hull of choice for 2-3/4", and either Federal or Remington MkVI's for 3".
for loading steel you will notice next to no data for Winchester compression formed hulls, because the steel wads need a straight sided hull to load properly.
I'd contact Will Bilozir in DeWinton, for the latest and greatest on steel reloading.
I unfortunatly do not have his number handy.
Good luck
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There are no absolutes
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