I'd start at 42gn and work back up to your load.Mil brass can come in at 2gn less a times.for this is what I have found when I tryed it in 223.I worked one load one time that took 2gn's less for the same POI for a Rem case.To add to this win brass holds the most from any other brass from what I undersatnd and have found myself.
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life is great but its better when you can own as many guns you wish to own.for me I haven't bought enough yet.
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