Thx to the suggestions from iicecube

I made a new modified version of Stallions ammo mod with the Firearms mod ammo added to the the boxes. All pistol ammo in one box, shotgun shells in another and so on, so its the same amount of boxes as the original mod instead of more than 20 different ones. I didnt put the explosives in the explosives box tho, the 40mm explosive, the explosive bullet and golden bullets are in theire own box. I mostly followed the categories used by the Firearms mod when sorting the ammo, and those three are categorized as special

I will probably tweak the drop rate and amount you can craft of the different ammo types after playing around with it
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