I’ve used mmo as handgun cleaner. I was told by several cops just to be careful using mmo in firearms that remain loaded, as mmo may penetrate the casings and into the powder, possibly causing misfires. Anyone know if this is true or a myth? Thanks. longchiro
You will have this problem with any oil that has penetrating qualities. It’s not the powder that is damaged, it’s the primer that will become inert. This is why military ammo has a sealant around the bullet and primer. Keep oils and solvents away from your ammunition.