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You'd be surprised on how often it happens, i started carrying, Suros Regime, Invective, and various side arms because of how often it happens during missions, strikes, raids etc.
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Because over the years the game seems desperately inclined to sometimes drop nothing but green ammo packs. This was especially true when Ice Breaker was equipped.
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With HCs its very possible
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Have you tried using Hawkmoon? Or pretty much any hand cannon for an extended period, as an actual primary? Also, during the raid, I frequently run out of ammo for Outbreak Prime, since I'm using it for adds and boss dps.