The "dupe" that someone who is definitely not me wrote about 2 years ago won't work on ume or pc as it takes 90 gunpowder and 15 metal to craft 30 simple bullets, which is used along with 30 gunpowder and 10 metal ingots to make 10 shotgun ammo. Grinding gives the same amount of materials, 20 metal ingots and 30 gunpowder, but since crafting ammo is buffed to 💩 on old mobile, it makes it look like a dupe when in reality the grind return seems to align with the grinder's 33% materials return since it costs 120 gunpowder and 25 metal to craft 10 shotgun ammo on ume and pc.