I find it pretty easy to sweep both hammers when mounting my hammer gun. I'm not sure I would find it ideal for grouse, but certainly, it would be quite doable though heavy 8+ lbs and 32". But I try to buy hammer guns with low hammers that are close enough together to do this easily. Perhaps it would be worth measuring a few guns that we all have and comparing notes.

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BrentD, (Professor - just for Stan)
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