So all of the time I have had with a pistol thus far has been military. The gun I would get to know inside and out, but the ammo I must say I never paid much attention to. Just picked up an M&P .45 and what I Thought would be a simple ammo selection process it turns out is not. The manual just says .45 ACP. Now I am wading through grains and what manufacturer is crap and so on. Can anyone dumb this down for me? I have used winchester white box before with good results in 9mm. Should I stick with that? What else is worth the $$? Anything to just stay away from all together?