Just give the handcannons a bit more ammo in PVE. It won't affect PVP at all., I don't believe I have ever seen a complaint on here about it being unfair in PVE about the hand cannons having too much ammo.. Even with armor that has the extra hand cannon perk, primary ammo is just way too scarce.
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Need some.My Iron Banner hand cannon only holds 40-51 max.