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I use Trail Boss for the 200 grain LSWCs in .45 Colt.
7.0 grains of Trail Boss gives about 90% load density with the 200 LSWC and should be a good place to start for a 165.
Lyman has data for a 175 LRN-FP and Hodgdon has data for 160s and 180s.
What powders do you have?
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