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Looking over my chronograph data I see I mis-spoke, 12.0grs AA#9 with the 170's = about 1200 fps out of a 4" GP-100 and about 1350 fps out of a 6" Security six. Both shot the same day. My notes say no leading and very accurate in both guns.
If I was to use H-110 I'd load 14.5 grs and expect similar results as above.
If I was to use H-110 I'd load 14.5 grs and expect similar results as above.