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Mr. 16 gauge,
The Lyman Cast Bullet Handbook says for the .380 and 121 grain cast bullet .980" OAL on page 264:
SR-4756 2.3 grains 662 fps. Max. 3.5 grains 927 fps.
Green Dot 1.7 grains 620 fps Max. 2.3 grains 760 fps.
Hope this helps.
Adam
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Adam Helmer
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