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You should be fine with the standard COL of "1.44-"1.45 while using a good roll crimp. I see that Alliant publishes a 158gn LSWC load with 4.7gn of Unique as a max. You should be fine using this data, and could push this a bit higher while keeping an eye on your pressure indicators. Instead of a start of 4.2, try 4.4 grains. I hope this helps at all.
Safe reloading!
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