Does magnetic shot still provide bonus damage / the deadly property to nonmetallic targets?

[OgreEye]

Magnetic shot reads as follows: "Shiny gray metal that slightly thrums when touched makes up the metal parts of a magnetic shot. When activated, the shot is more effective against a target wearing metal armor or made of metal. The activated ammunition grants a circumstance bonus to attack rolls against such targets, according to its type. Due to magnetic acceleration, the ammunition deals more damage and has deadlier critical hits, also according to its type." The argument I was presented with is that only the circumstance bonus actually specifies it needs to be used on metal targets to work, but personally, I don't know what else would accelerate a shot magnetically.

[Finoan]

I also interpret that item's description to mean that all benefits of the activated ammunition only apply when the target is wearing or is made of metal.

Yes, I can see the error in the phrasing of the description that allows a loophole to argue that only the attack roll bonus is dependent on the metallic traits of the target and the damage dice increase is always available.

I don't allow rules lawyering of that level in games that I run.