Sparked by this thread, I offer this discussion. This one will likely not get much attention since most younger CCW holders don't have much comparison to draw upon. The QC of many of the recent ammunition products are very good. Most of those that I found unacceptable are no longer offered. As follows are some that I have used over the last 5 decades. "Ball" Full metal jacket (FMJ) & standard issue for many of the world's military. QC WAS very spotty. Feeding is excellent due to the projectile profile. Many still train with it. I only train with what I carry and have transitioned away from this decades ago. NATO Very "hot" (high velocity). Used with some "sub-machine guns." I damaged a Browning Hi-Power and a S&W Model 59 using this. Never again in a handgun. One used in the FBI Miami shoot-out of 1986 Decent QC, but insufficient velocity. Was a costly mistake for the Bureau. Frangibles Once favored by the US "sky marshals" of the 1970s. Horrible accuracy even at the short distances for which it was invented. Wide-mouth hollowpoint UNRELIABLE feeding due to the distended cavity. RISKY!! Heavyweight bullet - 147 grain If you've actually seen the lack of tissue destruction in a human, you will see why the efficacy is lacking.