Your max ammo for snipers is 25 with armor that have extra heavy ammo perk, not extra sniper.
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With my stillpiercer I max at 23
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That's right... Hunters do not have any armor that increase special ammo... They only have sniper ammo increase.
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Pending the lucky rasberry perks
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If the armory is correct, lucky raspberry has specific ammo increases, not generic heavy/special ammo