The Pack Howitzer vet 3 seems better than 30%.
Vet 1-2: 45 seconds, Vet 3: 25 seconds
With three "The 6 Pack" 5% faster cooldown bulletins you get
Vet 1-2: 37 seconds, Vet 3: 21 seconds

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49 | ||
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31 | ||
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13 | ||
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9 | ||
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3 | ||
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1 | ||
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1 |