It seems like 124 or 147 grain ammo is the most popular for 9mm on this site. It also seems like most law enforcement agencies who still carry a 9mm are using the heavier bullets, ex. NYPD uses 124 grain +p as their carry ammo. Is the 115 grain bullet the reason many law enforcement agencies abandoned the 9mm to go to the heavier .40 or ..45 caliber? Are the newer 115 grain bullets any good? Anyone carry 115 grain for self-defense and if so, why? Alot of questions but I am carrying 124 grain hollowpoints because heavier 9mm seems to be the trend.