So very hard to say without having stood beside you when you were loading... Definitely it didn't like that load. Not as hot as B'seye...a bit smokey though. I went to the Alliant site and Unique didn't even list for 38 S&W... That says bags to me if they don't list it at all. 1.7 should have been light but perhaps too light, the air space made it even an greater pressure.
Alliant Powder - Reloader's Guide
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