Didn’t find anything with the search function, this may be a bug as well.
I stumbled across some .50 caliber ammunition in a humvee today. Not being in possession of anything that fired .50 I took it back to my makeshift shelter to breakdown for a shit ton of lead and gunpowder for crafting. Found this couldn’t be done with the bullet puller. Maybe I need higher skill in marksman or rifle or something, I’m not sure.
I suggest being able to break down .50 cal on account of being able to break down other cartridge based ammunition.