How to get weapons to use more then 1 ammo per shot

I'm modding the Gravedigger (gang shotgun), and I want to make it that 2 and 3 barrels upgrades use 2 and 3 shells per shot, respectively. I put in the appropriate strings in the Weapon Upgrades XTBL file,

<Ammo_per_Shot>2</Ammo_per_Shot>
<Ammo_per_Shot_OM>OM_REPLACE</Ammo_per_Shot_OM>

for the LVL2 upgrade, and

<Ammo_per_Shot>3</Ammo_per_Shot>
<Ammo_per_Shot_OM>OM_REPLACE</Ammo_per_Shot_OM>

for the LVL3 one, but in game, the upgraded shotgun still uses only 1 ammo per shot. What am I doing wrong?
 
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