I read about "low powered ammo" all the time causing failures in various guns (the Beretta PX4 compact here lately) and the response is usually "buy quality ammo and see if trouble goes away". My question is...which brands do you guys consider "low powered ammo" and which brands do you consider "good quality ammo". I ask this due to the fact that I've never had a problem with any ammo I've ever bought at a gun shop, shooting range, online, or Walmart causing any trouble with any pistol I own . I've shot Blazer Brass, Fiocchi, Federal, Magtech, Aguila, Prvi Partizan, RWS, Sellier & Bellot, Speer and Winchester in caliber of .380, 9mm, and .45 ACP. So whats "low powered" and whats "quality ammo"?