Just my 2 cts :
Until recently I seated 158-Gr. LSWC and LRN bullets in .38 Spl cases at COL between 37,25 to 37.35 mm ( =1.466" to 1.470 "), depending on exact bullet tip profile.
After a tip from a German bulletmaker, I tried seating them at COL 38.4 mm (= 1.512 ").
The longer ones always proved more accurate.
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