I have a question about PPU 55gr SP ammo. Anyone have any idea how it stacks up against Gold Dot 55 gr? I know Gold Dots are bonded, but will the PPU do a good job for self defense? Any idea on penetration? I have some XM193 and Gold Dot 55 gr now, but found a sale on the PPU saving $3.00 a box over the Gold Dot.