There is all sorts of 9mm ammo on the market. Ranging from the mild 115 grain full metal jacket loads that are ideal for some tiny 9mm pistols, to powerful hollowpoint ammo, you’ll find 9mm ammo for every need you might have.nnFor common range practice, inexpensive full metal jacket ammo is perfect. It is inexpensive, accurate and will function in pretty much any 9mm pistol. In fact, if you can’t get your gun to run 115 grain ball ammo, there is probably something wrong with it.nnOf course, you’ll want to make sure your gun can function with the sort of defensive ammo you want to carry. Sometimes hollowpoint ammo has trouble feeding, and individual guns can be oddly picky about the ammo they will feed – to the point where two identical guns might not shoot the same ammo well. Of course you can always do a “fluff and buff”of your gun to improve how it feeds ammo. A simple feedramp polishing and maybe different extractor springs can do wonders for how a gun performs.nnYou’ll also find subsonic ammo for shooting out of 9mm pistols with silencers. Because the bullet is traveling below the speed of sound, they can be extremely quiet when fired from a suppressed pistol. This is excellent for hearing safety, and reducing noise pollution when shooting at ranges.nnAs a general rule, you will use full metal jacket ammo for target shooting or because your gun won’t feed other types of ammo reliably (this is especially common with older and vintage 9mm pistols), and will use hollowpoint ammo for daily carry. Be careful, high pressure 9mm ammo (rated +p or +p+) should only be fired in guns clearly approved by the manufacturer for high pressure ammo. Using it in guns not rated for high pressure ammo can destroy the gun and lead to serious personal injury.